[[quoteright:200:[[Franchise/TheLegendOfZelda http://static.tvtropes.org/pmwiki/pub/images/triforce2.jpg]]]]
[[caption-width-right:200: ''[[WesternAnimation/SchoolHouseRock ♫ You can seeeee if it's threeeee it's a magic number... ♫]]'']]

->''"Just the place for a Snark! I have said it twice: \\
That alone should encourage the crew. \\
Just the place for a Snark! I have said it thrice:\\
What I tell you three times is true."''
-->-- '''Lewis Carroll''', ''Literature/TheHuntingOfTheSnark''

Sometimes called trebling, the Rule of Three is a pattern used in stories and jokes, where part of the story is told three times, with minor variations. The first two instances build tension, and the third releases it by incorporating a twist.

This is especially common in storytelling. [[YoungestChildWins The third of three brothers succeeds after his older siblings each failed.]] The protagonist is given [[TheThreeTrials three tests]] and receives the prize after the third. It's almost unusual to find a folktale that does ''not'' incorporate the Rule of Three in some form. This may be an artifact of the oral tradition, in which the stock formula of the first, second, and third attempts makes the story easier to remember.

Following on from the oral tradition, speech-writers have learnt the 'Rule of Three' -- listen to a political speech -- the points come in threes, from 'Ein Volk, Ein Reich, Ein Führer' to Tony Blair declaring 'Education, education, education'. In persuasive or educational speaking, it also is a foundational concept: "Tell 'em what you're going to tell 'em; Tell 'em; Tell 'em what you told 'em" [[note]]Formally: An Introduction and Precis; the Body of the speech, the Summary.[[/note]]

The Rule of Three is also used widely in comedy. Many popular jokes are based on three {{Stock Character}}s (e.g. Priest, Imam, Rabbi), all in the same situation. The first two react normally, the third does something ridiculous (but stereotypically in character). In Britain, ''Englishman, Irishman and Scotsman'' jokes denigrate either the Irishman as stupid or the Scotsman as a tightwad, while the Englishman is usually the StraightMan of the gag (Unless it's being told by the Scots or Irish. When an American tells it, Englishmen are stuffed shirts.) This is why most Americans have [[BritainIsOnlyLondon never heard of Wales]]. Another (geeky) variant is the engineer/physicist/mathematician series of jokes, however, these are virtually never considered offensive, largely because the stereotypes are often jokingly accepted by the members of those three groups. (e.g. The engineer is overly practical, the physicist makes large assumptions, and the mathematician comes up with [[MathematiciansAnswer a correct, but useless answer]]; these are played up for humorous effect, but have some valid basis.)

A more popular variation on the rule is to repeat the same joke or concept three times, but put a twist on the third one that makes it funny again. One version of this is TheTriple, wherein a character lists three items - the first two logical and serious, and the [[ArsonMurderAndJaywalking third applying a twist or joke]]. For example, a character might say [[IgnoreTheDisability to a bald person]], "Can I get you anything? Cup of coffee? Doughnut? Toupee?" (From ''Series/TheDickVanDykeShow''.)

Alternatively, the twist can come during the second iteration (such as ChekhovsSkill) [[SubvertedTrope failing the first time it's used]] only to return to its original form on the third pass; this version tends to accompany [[ThisIndexWillBeImportantLater Chekhov's tropes]].

The OverlyLongGag could be seen as a subversion of the Rule Of Three, because it fails to deliver the expected twist.

Sometimes, an event needs to be shown three times to establish that a variation to the norm is happening. The first time the audience sees this event, they see it happening a certain way, but they don't yet know that this is typical. The second time they see it, it is the same as the first. This establishes that this is the standard way that things always happen. The third time they see the event in question, it is different, so the audience knows that this is a deviation from the norm. For example, in ''Film/TheShawshankRedemption'', we see Red appear before the parole board three times. The first two appearances are practically identical. The third instance is different, indicating how Red changed after Andy left.

The trope is also incredibly common in fairytales and ghost stories that are part of oral tradition. The reason above is important, as audiences don't have a good idea of how this ghost/gnome/witch would typically behave, and it works well for building tension too. But another reason is that it's easy to remember. You get three times the story padding for only having to remember one short story and some minor variations. This makes the story easier to remember than non-repeating tales of the same length, both for professionals who collect as many stories as possible, and for people that pass a story on pretty much because they happened to remember it.

In art, there's a rule of ''[[http://en.wikipedia.org/wiki/Rule_of_thirds thirds]]'' where putting items in the intersections between thirds-lines draws more attention and is more visually appealing than plonking them right in the center, which is considered boring. In design, particularly three-dimensional design such as shop displays, groups of three objects, or objects arranged to form a triangle, are considered most attractive to the eye.

The Rule of Three may be a subtrope of a more general psychological phenomenon, as threes are well-noted in all forms of culture. Films, books and plays come in {{trilog|y}}ies. They have a ThreeActStructure, a Beginning, Middle and End. Counts of three elements are used widely in rhetoric, writing and myth: "Ready, aim, fire", "Veni, Vidi, Vici", "Lights, camera, action", "Reading, 'riting, 'rithmetic," "rhetoric, writing and myth". Just try and think about how many times you've heard the phrase [[OnThree "On the count of three..."]]

A constructed phrase such as "Veni, Vidi, Vici." that has three grammatically and logically connected elements is known as a Tricolon. When the three elements increase in length, it's a Tricolon Crescens.

This is why there are {{Power Trio}}s and {{Terrible Trio}}s.

Variations on this trope include uses of 5, 7, 12, and convenient multiples of 5 afterwards (i.e., 25 or 50, but not 35 or 70).

{{Sub Trope}}s include ThreeWishes, TheseQuestionsThree, ThirdTimesTheCharm, TrilogyCreep, OnThree, CountingToThree, TheThreeCertaintiesInLife, TwoOutOfThreeAintBad, and ThreeStatSystem.

See also [[{{Conflict}} Basic Conflicts]] and other plot devices which often come in [[NumerologicalMotif 3s or 7s]], and Administrivia/ThreeRulesOfThree, a wiki guideline. Not to be confused with [[FourIsDeath 4]], unless you're counting [[FourElementEnsemble elements]], [[FourTemperamentEnsemble bodily fluids]], and other dimensions.[[note]][[Film/MontyPythonAndTheHolyGrail 5 is right out.]][[/note]]



* It's a general law of advertising that the product will be mentioned at least three times, to ensure it lodges firmly in the brain.
* ''Nick At Nite'' has run commercials for itself, emphasizing this type of comedy bit and going so far as to call it 'the triple'.
* "Advertising/HeadOn, apply directly to the forehead. Advertising/HeadOn, apply directly to the forehead. Advertising/HeadOn, apply directly to the forehead." And its lesser-known sister ad: "Freedom from hemorrhoids, [=FREEdHEM=] hemorrhoid cream. Freedom from hemorrhoids, [=FREEdHEM=] hemorrhoid cream. Freedom from hemorrhoids, [=FREEdHEM=] hemorrhoid cream."
* A Toyota commercial has a hybrid car speeding along with three black horses, three white horses, three hang-gliders, and three fighter jets to show that [[LighterAndSofter soft]] and [[DarkerAndEdgier edgy]] can get along.
* A series of Warburton's Bakery adverts in the UK used an extremely long-burning (the last ad came two years after the first two, which were six months apart) version of "the third is the punchline". The first one had Creator/SylvesterStallone approaching John Warburton to propose [[MundaneMadeAwesome an action movie about bread delivery]]. The second had Franchise/TheMuppets approach him about a musical extravaganza featuring crumpets. Both ended with a somewhat gobsmacked Warburton endorsing the concepts. Then the third one had Creator/PeterKay suggesting a CostumeDrama about the company's origins. This time, Warburton calls security.

[[folder:Anime & Manga]]
* LampshadeHanging: ''Manga/SgtFrog'' episode 9 has Moa blowing up Giroro and Keroro twice in a row. Then it happens a third time, and the [[LemonyNarrator narrator]] explains that this is due to the conventions of humor.
* The ''Mazinger series'' used this trope continuously. Starting with the original TRILOGY:
** ''Anime/MazingerZ'': The eponymous HumongousMecha is a CombiningMecha formed by three parts: Mazinger-Z, the Hover Pilder and the Jet Scrander. The Photon Atomic Power Research Institute is protected by three HumongousMecha: Mazinger-Z, Aphrodite-A and Boss Borot. Throughout the series three {{FemBot}}s show up: Aphrodite A, Minerva-X and Diana-A. Prof. Yumi is aided by three scientists (Profs. Morimori, Sewashi and Nossori). The Boss' gang is formed by three members: Boss, Nuke and Mucha. Dr. Hell never had more than three CoDragons at once, and several times he sent three-mecha teams to take down his enemies (Aeros B1, B2 and B3; Megaron P1, P2 and P3). Baron Ashura kidnapped three workers of the Institute in one episode (Kasuya, Kata and Yokoi). A Mechanical Beast could split in three parts could act and attack independently...
** ''Anime/GreatMazinger'': The Fortress of Science is protected by three robots: Great Mazinger, Venus-A and Boss Borot. The BridgeBunnies are three. Prof. Kabuto had three sons [[spoiler:Tetsuya, Kouji and Shiro]]...
** ''Anime/UFORoboGrendizer'': Prof. Umon was assisted in the Lab by three BridgeBunnies (Hayashi, Yamada and Aoi). Makiba family was formed by three members: Hikaru, Danbei and Goro. Duke battle partners were Kouji, [[spoiler:Hikaru]] and [[spoiler:his sister Maria.]] Grendizer got three {{MidSeason Upgrade}}s: Double, Marine and Drill Spacer...
* In ''Anime/DragonBallZ'', before King Kai (King Kaio) agrees to train someone, they must make him laugh with a joke. Tien performs the multiform technique to create 3 bodies just before shouting the punchline. Thus making his joke 3 times funnier.
* Rule Of Three is referenced in ''Manga/GoldenBoy'' by a couple of proverb-misquoting Yakuza members: "Even Buddha only waited three times."
%%* This is all over the place in Anime/DigimonTamers.
* Manga covers for ''Manga/HighschoolOfTheDead'', the main girls stars at each 3 volumes with no changes so far, the formula is one volume for Rei then Saeko and finally Saya, they are the only main characters to appear on covers.
* ''LightNovel/HaruhiSuzumiya'': The ''third'' [[spoiler:Endless Eight episode]] has Itsuki state that [[spoiler:"We have entered an endless recursion of time."]] three times in a row.
* In ''Anime/TransformersArmada'', the ultimate weapon, the Hydra Cannon, is made of three smaller uber-weapons, the Star Saber, Skyboom Shield, and Requiem Blaster. Each of these is itself made of three Mini-Cons.
* Specifically invoked by Batou in ''Anime/GhostInTheShell 2: Innocence''.
* ''Manga/OnePiece''
** There are three marine admirals: Akainu, Aojiki, and Kizaru.
** Three great powers: the Marines/World Government, the Shichibukai, and the Yonkou.
** The Monster Trio in the Strawhat crew consists of Luffy, Zoro, and Sanji.
* In ''Manga/FairyTail'', there are three true [[spoiler:Dragon Slayers]]: Natsu, Gajeel, and [[spoiler:Wendy]]. Also, there were three active S-Class mages in the guild: [[spoiler:Laxus, Erza, Mystogan]]. Then: [[spoiler:Erza, Mirajane and Mystogan]]. Later: [[spoiler:Erza, Mirajane, Gildartz]]. After the TimeSkip: [[spoiler:Erza, Mirajane, and Laxus]].
* In ''Anime/YuGiOh'', there are three Legendary Dragons and three corresponding Legendary Heroes. We also have the Blue-Eyes Ultimate Dragon and Cyber End Dragon, formed by fusing three of the same monsters into one. Egyptian God Monsters, of which there happen to be three, demand a sacrifice of three monsters to be summoned. There are also three levels of the Orichalcos: Seal of Orichalcos, Orichalcos Deuteros, and Orichalcos Tritos. There are three powerful magicians (Dark Magician, Dark Magician Girl, Magician of Black Chaos) that form a trio.
** And three Phantom Beasts. And three Wicked Gods. And the English manga was published as three series (Manga/YuGiOh for the first seven volumes, Manga/YuGiOh Duelist for Duelist Kingdom onward, and Manga/YuGiOh Millennium World, following the Duel City finals).
** ''[[Anime/YuGiOhGX GX]]'' even has three Kaiba {{exp|y}}ies.
** ''[[Anime/YuGiOhArcV ARC-V]]'' portrays the three Extra Deck summoning methods (Fusion, Synchro, and Xyz) with this dynamic, with each having its own dimension and specializing duelists. In-story, Pendulum Summon (which focuses on quickly amassing materials for the aforementioned methods) and the Standard Dimension (where all three co-exist without any of them being dominant over the others) act as bridges between them.
** ''[[Anime/YuGiOhVRAINS VRAINS]]'' has Yusaku Fujiki stating ''many'' things in threes ''very'' often. [[spoiler:It's because during the [[ColdBloodedTorture Lost]] [[ForScience Incident]] [[DarkAndTroubledPast ten years prior to the start of the series]], a voice told him to think of three things which saved him for succumbing to the hellish reality he was forced into and dying in a pit of deep despair.]]
** The same goes for quite a few regular cards. There were originally three Harpie Lady Sisters, three monsters that made up the Gate Guardian, three Machines that make up the XYZ-Dragon Cannon and of course, one of the biggest rules in the game is that you can have a maximum of three copies of a card in your deck (at least in most cases).
* The 3 kids Maurice, Maeter, and Linck in ''Manga/EurekaSeven'', as well as the number of times Nirvash and TheEND fight each other.
* ''Manga/{{Eyeshield 21}}'' ends with 333 chapters. Many of the close friendships in the series are in groups of three.
* ''Manga/{{Dokuhime}}'' has triplet princes who were predicted to be the "perfect child, protecting child, and destroying child", the last one having a tell-tale birthmark (the king loved them so he marked the other 2 and raised them all the same). Sure enough, one is [[spoiler: posing as the deceased king]], another is [[spoiler: the poison tester]], and the 3rd [[spoiler: alone is a brilliant engineer but was so traumatized by seeing his father's death that he looks a lot younger and can't stop killing things]], but that hasn't yet proved anything. Despite being triplets they no longer look the same: the one who's [[spoiler: posing as the king]] [[YoungerThanTheyLook looks older]] while the one who [[spoiler: is traumatized and can't stop killing]] [[OlderThanTheyLook looks younger.]]
* ''Manga/VampireGame'' has 3 princes who are [[spoiler: the 3 "adopted" sons of the king. Well, 2 were adopted and the 1st was illegitimate]].
* In the anime ''Anime/NeonGenesisEvangelion'', First Impact happened before humanity existed, Second Impact in the last two decades, and the objective of [=NERV=] is to stop [[TheEndOfTheWorldAsWeKnowIt Third Impact.]]
* Most of the skits in ''Manga/DailyLivesOfHighSchoolBoys'' rely on a triple repeat of the same joke or three jokes with the same theme.
** Three students slip on frozen puddles in one skit.
** Yoshitake's PaperThinDisguise as Karasawa by wearing a white cap works three times in the Kick The Can skit (twice on Mitsuo).
** Mitsuo makes three attempts to get a soccer ball past Hidenori during the Sure Kill Shot skit. [[spoiler:Third time ''is'' the charm in this case.]]
* ''Anime/{{Pokemon}}'':
** The anime always has three main characters (Ash and his two companions, one male, one female, with Hoenn being the exception due to Max tagging along, and Kalos with Bonnie being part of the group), plus the Team Rocket trio.
** According to ''LightNovel/PocketMonstersTheAnimation'', if a gym leader loses three times in a row they are forced to quit. This causes many gym leaders to bribe trainers in order to lose.
* In ''Manga/YuYuHakusho'', there are three main worlds separated dimensionally: The human world, the spirit world, and the Makai world; the latter in turn has three major rulers: Mukuro, Yomi, and Raizen ([[spoiler: when the latter one dies, a tournament is run to decide who will rule all three worlds]]). Averted in the second movie, where it's revealed that there is actually a fourth world.
* ''Manga/AhMyGoddess'' features a Goddess who plays the part of Mercury in the HonestAxe myth. The first time she makes the offering, it is a gold and silver harp to the man who she comes to love. The second time, it is an exceptionally sharp axe [[spoiler:to herself so she can break free from her spring]]. The third time, it is [[spoiler:a gold and silver bike to Keiichi who is on the verge of losing Belldandy in [[ItMakesSenseInContext a bike race against God]]]].
* Big 3: A FanNickname about the three most popular manga from Weekly Shonen Jump.
* In ''Manga/FushigiYuugi'', each priestess gets ThreeWishes. Miaka's evolve from entirely selfish to a combination of selfish and selfless, to entirely selfless over the course of the series as she plans out what to ask of Suzaku. [[spoiler: She only actually makes ''two'' wishes.]]
* Background material for the original ''Anime/MobileSuitGundam'' notes that standard mobile suit tactics for the Principality of Zeon involved squads of three Zakus. The Federation fudged this a bit for space battles, mimicking that with three [=GMs=] per squad, but with the addition of two Balls as support. This also comes up in many of the Universal Century series, where while the number of leading protagonists who pilot them will vary, it often ends up that there are three mobile suits among them (for instance from the original series, Amuro's Gundam, Kai's Guncannon, and Ryu and Hayato's Guntank).

* ''Art/TheLastSupper'': The painting contains several notable appearances of the number three, perhaps reflecting the Christian doctrine of the Holy Trinity.
** The apostles are grouped into four groups of three.
** There are three windows in the room.
** Christ is depicted in a triangle shape, with his hands and his head as the corners of the triangle.

* Characters in ''ComicBook/{{Slaine}}'' constantly refer to things in groups of three -- three great silences, three sorrows, etc.
* The irreducible simplicity of Ernie Bushmiller's ''Nancy'' depends in part on the principle of "the three rocks".
--> Creator/ArtSpiegelman explains how a drawing of three rocks in a background scene was Ernie's way of showing us there were some rocks in the background. It was always three. Why? Because two rocks wouldn't be "some rocks." Two rocks would be a pair of rocks. And four rocks was unacceptable because four rocks would indicate "some rocks" but it would be one rock more than was necessary to convey the idea of "some rocks." --Scott [=McCloud=]
* In a somewhat similar vein, Creator/AlanMoore repeatedly employs a 9-panel grid - three wide, three high - in most of his comics. While the format in itself obviously predates Moore, Moore was (one of) the first to combine it with the {{Beat}} panel, lending a certain rhythm and gravitas to even the most rote conversations in his stories.
* In Creator/MarvelComics, there are the Warriors Three, three heroic Asgardians -- Fandral, Hogun, and Volstagg -- who are lifelong friends and fighting companions.
* Before the ComicBook/{{New 52}}, Creator/DCComics published a limited series called ''Trinity'' essentially establishing Franchise/{{Batman}}, Franchise/WonderWoman, and Franchise/{{Superman}} as the center of the DC Universe. They've used the term "trinity" to refer to the three characters since. After the reboot, the first major crossover for the Franchise/{{Justice League|OfAmerica}} was the ''Comicbook/TrinityWar'', in which three different Leagues (the main Justice League, the ComicBook/{{Justice League of America|2013}}, and ComicBook/JusticeLeagueDark) first clash then unite, then break into three groups, each led by a different member of the "trinity" and accompanied by a different member of the "Trinity of Sin" (New 52 versions of Comicbook/TheQuestion and ComicBook/ThePhantomStranger, and new character Pandora). [[spoiler: The events of the "war" are revealed to be part of a plot by the Crime Syndicate, MirrorUniverse versions of the Justice League from AlternateUniverse Earth-3]]
* ''ComicBook/{{Iznogoud}}'': Iznogoud once bought a magic catalogue that allows him to obtain items from the future but cannot use it more than three times.

[[folder:Fan Works]]
* ''Webcomic/AxisPowersHetalia'' fanfic ''[[https://www.fanfiction.net/s/11886910/1/Gankona-Unnachgiebig-Unità Gankona, Unnachgiebig, Unità]]'': Three main characters, three mean people, [[{{Polyamory}} three people in a relationship]].
* ''Fanfic/CalvinAndHobbesTheSeries'' uses this sometimes, like how there are three suspects in [[Recap/CalvinAndHobbesTheSeriesS1E26TheCaseOfTheRogueWaterBalloon "The Case of the Rogue Water Balloon"]].
* ''Manga/{{Evangelion 303}}'': This is often used, such like relationships between characters (love triangles and characters with two close friends abound), and even in the story structure (it is split into three parts).
* In ''Fanfic/ForbidenFruitTheTempationOfEdwardCullen, Jacob calls [[MarySue Tia]] a "HALF-BREAD!" three times, while jumping up and down.

[[folder:Fairy Tales and Folklore]]
* Common. A selection:
** "Literature/GoldilocksAndTheThreeBears" is built around this trope. The chairs are too hard, too soft, and just right, the porridges are too hot, too cold, just right, and so on.
** In "Literature/TheThreeBillyGoatsGruff", the 3rd and largest goat defeats the troll.
** "Literature/{{Cinderella}}" traditionally goes to the ball 3 times before losing her shoe. Later, the 2 step-sisters each try the shoe on before Cinderella steps forward.
** The "Literature/ThreeLittlePigs": the first 2 pigs' houses fail to ward off the Big Bad Wolf, while the 3rd's brick house remains sturdy.
** In the Grimms' "Literature/SnowWhiteAndTheSevenDwarfs" story, the wicked Queen makes three attempts on Snow White's life (a cursed comb, strangling her with a bodice lace, and the famous poisoned apple).
** In "Literature/{{Rumpelstiltskin}}", the title character gives the miller's daughter three days to [[IKnowYourTrueName guess his name]]. After he spun for her for three nights.
** In "Literature/JackAndTheBeanstalk", Jack steals three treasures from the giant: a bag of gold, a goose that lays golden eggs, and a singing harp.
** "The Honey Princess": Three princes are set to accomplish three tasks in order to win three princesses' hands in marriage.
** "[[http://www.surlalunefairytales.com/rumpelstiltskin/stories/3spinners.html The Three Spinners]]" help a girl against an impossible spinning task.
** In "Literature/BrotherAndSister", it is the third stream that Brother drinks from; it is the third time he goes out to hunt that the king finds Sister; it was the third time she returned from the dead that her husband caught her and brought her back to life.
** In "Literature/EastOfTheSunWestOfTheMoon", the heroine meets three women who give her gifts; she uses them to bribe her way to her husband, and the third time, he is not drugged to sleep.
** In "[[http://www.surlalunefairytales.com/maidmaleen/index.html Maid Maleen]]", when she is pretending to be the bride, she speaks to three objects; the bride must find out from her three times what she said, and the bridegroom figures out the substitution.
** In "[[http://www.surlalunefairytales.com/authors/grimms/186truesweetheart.html The True Sweetheart]]", the heroine goes to the ball three times.
* Anecdotes have plenty of examples. For an example, three nation anecdotes.
* In "Literature/TheThreeAunts", the three aunts help her on three successive nights.
* In ''Literature/IronHans'', the prince gets three chances to watch the well. He fails all the three, but only on the third is he sent away.
* In ''Literature/{{Bearskin}}'', the hero tells the youngest daughter to wait for him three years -- if he doesn't return then, he's dead and she's free to marry as she wishes.
* In ''Literature/TheLoveOfThreeOranges'' -- well, three oranges. Or citrons or whatever.
* In ''Literature/TheRoseTree'', the girl loses three sets of candles, and later gets three gifts.
* In ''Literature/TheFeatherOfFinistTheFalcon'', the daughter asks three times for a gift, meets three old women along the way, and at the end, bribes the bride three times before she manages to wake Finist.
* In ''Literature/BootsWhoMadeThePrincessSayThatsAStory'', Boots is the youngest of three brothers to try the engagement challenge.
* In ''Literature/TheGoldMountain'' the hero must endure three nights of escalating beatings to break the curse. Later, he finds three giants arguing over three magic items, which he steals and uses to get his kingdom and his family back.
* In Creator/TheBrothersGrimm's ''Literature/TheGoldenGoose'', three sons, and three innkeeper's daughters
* In "Literature/ThePrincessOnTheGlassHill", three brothers, three horses, and three golden apples.
* In the story CryingWolf an actual wolf appears only after the first two times the boy cried wolf.
* In ''Literature/TheBlackThiefAndTheKnightOfTheGlen'', there are three princes, and the thief tells three stories to ransom them, and the first story features three witches.
* In ''Literature/TheStoryOfTheYouthWhoWentForthToLearnWhatFearWas'' the youth has two spent three nights in a HauntedCastle.
* In ''Literature/SoriaMoriaCastle'', he rescues three princess, from trolls with three, or six, or nine heads.
* In Creator/AsbjornsenAndMoe's ''Literature/TheSevenFoals'', three drinks from the flask are needed to lift the sword.
* In ''Literature/TheJezinkas'', there are three jezinkas.
* In ''Literature/JesperWhoHerdedTheHares'', he has two older brothers, and is set three tasks.
* In ''Literature/TsarevichPetrAndTheWizard'', he was one of three brothers, and finds three princesses.
* In ''Literature/TheThreeLittleMenInTheWood'', the little men.
* In ''Literature/{{Pintosmalto}}'', Betta bribes the queen three times for three nights.
* In the fable of the Honest Woodsman, a woodsman loses his ax in an accident when it flies into the river. When a water spirit appears, he tells her of his dilemma, and then she dives into the river to find his ax. It takes three such dives before the woodsman recognizes the ax as his. As a reward for his honesty, he also gets to keep the other two axes the spirit had dug up.
* In ''The Princess Who Wore A Rabbit Skin Dress'', a queen had three husbands -- the first was the father of her daughter, the second gets no details and makes no impact on the story, and the third, after her death, wants to marry her daughter.

[[folder:Films -- Animated]]
* This is all over the place in the [[Franchise/DisneyAnimatedCanon Disney films]]:
** ''Disney/OliverAndCompany'': "Three sunrises. Three sunsets. Three days, Fagan."
--->'''Fagin:''' Three sunrises, three sunsets, three days... Three and three and three... is nine. Nine?\\
'''Sykes:''' No, Fagin. ''Three.''\\
'''Fagin:''' ''(alarmed)'' Three? Oh, you mean just three days?! Oh, I'm having a bad day!
** ''Disney/TheLittleMermaid'': "Before the sun sets on the third day..."
** ''Disney/{{Aladdin}}'': Whoever summons the Genie can ask for ThreeWishes. But there are also three things the genie can't do: kill, force love, or raise the dead (though that's excluding his earlier statement that wishing for more wishes is not allowed either). Also, it's three days (according to the Sultan) 'till Jasmine's birthday.
** In ''Disney/{{Mulan}}'', Mulan has three animal companions (Cri-kee, Khan and Mushu) and three human buddies (Yao, Ling and Chien-Po) while serving in the army. At home, she has three living relatives (father, mother and grandmother -- Mulan's little brother significantly is changed into a dog called Little Brother). Also, Mulan's family is the third in town to receive a conscription notice.
* In ''WesternAnimation/TheFlightOfDragons'', when Carolinus first decides to inspire TheQuest to bring about his idealized magic realm, Lo Tae Shao reminds him that there must be three warriors at the start of a quest, because "the laws so command it."
* The Medal of Everlasting Life from ''WesternAnimation/TheBookOfLife''. Chakal had it. Xibalba stole it back, causing Chakal to go monomaniacal to seek it back. But Xibalba traded it to Joaquin, who used it to launch himself to fame in hopes of honoring his father. Then Joaquin lost it to one of the banditos, who in turn ended up losing it to the citizens of San Angel, before Joaquin gave it to Manolo.
* ''WesternAnimation/KuboAndTheTwoStrings''
** The legendary armor Kubo seeks is made up of three separate pieces; the Sword Unbreakable, the Breastplate Impenetrable, and the Helmet Invulnerable.
** The main protagonists are Kubo, Monkey, and Beetle.
** Kubo's shamisen, a traditional Japanese instrument with three strings. [[spoiler:During his final confrontation with the Moon King, Kubo re-strings his shamisen with the strand of his mother's hair he carried with him, his father's discarded bowstring, and a strand of his own hair]].

[[folder:Films -- Live-Action]]
* In the second ''Film/AmericanPie'' film, Stifler explains to Kevin that the rule of three implies that if a girl tells you how many guys she slept with, the real number is [[ReallyGetsAround multiplied by three]]. In a similar conversation, Jessica explains to Vicky that if a guy tells you how many girls he slept with, the real number is divided by three.
* ''Film/PiratesOfTheCaribbeanTheCurseOfTheBlackPearl'': Both parley and thinking of the pirates' code as guidelines are both mentioned thrice over the course of the movie:
** Elizabeth uses parley to spare her life; Jack tries it later on his old partners to no avail; and Pintel warns Jack's captured crew not to think of playing the parley card. In this case, though, it's more like "Rule of ''Four''", as when the pirates are captured by the soldiers, Pintel nervously tells them, [[IronicEcho "...Parley?"]]
** Barbossa informs Elizabeth that he finds the pirates' code to be more like guidelines than actual rules; something she recites to Jack's crew; and something they tell him at the end of the film.
* In ''Film/{{Teeth}}'', Dawn's nether region severs exactly three penises on screen.
* In ''Film/IndianaJonesAndTheLastCrusade'', Indy must pass three tests (The Breath of God, The Word of God and The Path of God) to get to the Grail temple. Then comes ''Film/IndianaJonesAndTheKingdomOfTheCrystalSkull''. "Three times it drops..." [[InevitableWaterfall Hoo boy.]]
* ''Film/MontyPythonAndTheHolyGrail'':
** "Who would cross the Bridge of Death must answer me these questions three, ere the other side he see...". The trope is subverted four times; the first time, the three questions are all easy, so the knight easily crosses. The second knight unexpectedly receives a third, difficult question which results in his death, while the third knight unexpectedly gets an easy question again but fails to answer it correctly and dies. On the final set of questions, King Arthur subverts it again by asking a question back to the bridge keeper, resulting in the ''bridge keeper's'' death. Additionally "...then thou shalt count to three, no more, no less. Three shall be the number thou shalt count, and the number of the counting shall be three. Four shalt thou not count, neither count thou two, excepting that thou then proceed to three. Five is right out."
** The first castle sank into the swamp. The second castle sank into the swamp. The third castle... burned down, fell over, and then sank into the swamp.
** An unfilmed scene would have shown Arthur and Bedevere about to cross the lake to the castle Argh, only to be accosted by the bridge keeper again, who says, "He who would cross the Sea of Fate must answer me these questions twenty-eight!" After some deliberation, Arthur and Bedevere toss him into the lake and continue on their way.
* ''Film/{{Airplane}}!''. During the landing sequence, Dr. Rumack (Creator/LeslieNielsen) steps into the cockpit three times and says "I just want to tell you both good luck. We're all counting on you" in exactly the same way: once as they begin the descent, once in the middle of the landing, and once after the plane is on the ground.
* Creator/RobertRodriguez wove multiple instances of the Rule Of Three into his scenario for ''Film/ElMariachi''. Example: The BigBad, a heavy smoker, is twice seen striking a match off his resentful [[TheDragon Dragon's]] cheek; the third time it happens, the Dragon is doing it to the (dead) Big Bad. In his book, ''Rebel Without a Crew'', Rodriguez calls this "the kindergarten school of filmmaking", what he used to write a script that was interesting but also (and more importantly) ''quickly finished''.
* Guy Richie's first two films, ''Film/LockStockAndTwoSmokingBarrels'' and ''Film/{{Snatch}}'' feature dialogue exchanges where two characters repeat the same line of dialogue three times while responding to another character. "No, Harry, you can't" in the former and "Yeah, dad, you told us" in the latter.
* In ''Film/AustinPowers'', Dr. Evil's Mook Mustafa will answer a question if asked three consecutive times. The scene with him in ''The Spy Who Shagged Me'' uses the Rule twice. Austin discovers his weakness when he asks one question three times, then he asks another question three times, and finally on the third question he asks it once, then says, "Do I really have to ask you three times?" and asks it two more times, but Mustafa refuses to answer because he interrupted the questioning with a different question. Then Mustafa gets shot.
* In ''Film/NationalLampoonsChristmasVacation'' Clark asks his cousin-in-law, Eddie, "Can I refill your eggnog for you? Get you something to eat? Drive you out into the middle of nowhere and leave you for dead?"
* ''Film/DeadMenDontWearPlaid'' uses Reardon's BerserkButton thrice: the first time introduces it, the second incorporates it into a StockFootage gag, and the third time precipitates the climax.
* Film/TheThreeStooges. There were actually 6 of them, but never more than 3 in any one production.
* Film/{{Beetlejuice}}, Beetlejuice, ''Beetlejuice''!
* The Swedish classic ''Äppelkriget'' (War of the Apples) takes this for a very odd twist. At one point the story segues into the back story of three brothers who go to the city to find fame and fortune. On the way, they stumble over an old book, a carpet with a hole in it, and a dead bird, all of which the two eldest brothers reject, but the third brother takes with him, thinking that they "could be useful". When they apply for jobs, two brothers fail the psych test, but the third uses the book (a psychology textbook) and succeeds. The two eldest fail to impress the ladies, but the youngest wears his carpet as a trendy outfit and is an immediate hit. Later they're all broke, but the odor of decomposing bird leads the youngest to a stash of cash in an old recliner. Finally they've used up the money, and go back to the farm to hang themselves... and as it turns out, only the youngest managed to do that right, too.
* ''Franchise/StarWars'' examples:
** The [[FinalBattle Death Star Attack]] from ''Film/ANewHope''. First attack run, easily blown to pieces in seconds by [[RedBaron Darth Vader]]. Second run, someone makes the full run, but misses the actual shot. Third run, Luke's all clear; he blows that thing and goes home.
** ''Film/TheEmpireStrikesBack'' features three uses of this, though some are actually subversions:
*** Darth Vader [[YouHaveFailedMe Force-choking his subordinates]]. First, he chokes the incompetent Admiral Ozzel from an entirely different ship and [[YouAreInCommandNow promoting Captain Piett to his place]]. Later, Vader kills Captain Needa for not capturing the ''Millennium Falcon''. Then at the end, when the ''Falcon'' jumps into hyperspace and escapes despite the Imperials sabotaging its hyperdrive, Piett expects this - but Vader just walks off the bridge.[[note]]Director Irvin Kershner, in the DVD commentary, says that he thinks Vader is too upset that the Falcon escapes, despite the Imperials sabotaging the hyperdrive, that he merely forgets to kill a minion. According to him, Piett and the other officers were right to be afraid as he stormed off the bridge, especially considering we did see him kill two other officers for their screwups across the film.[[/note]]
*** The Millennium Falcon trying to jump into hyperspace. First they're being pursued by a Star Destroyer away from Hoth; Han attempts to jump into hyperspace but nothing happens. Then, after leaving the asteroid field and having supposedly repaired the hyperdrive, they try again and again it fails. Later, with Lando now at the controls, and with the hyperdrive supposedly fixed by Lando's mechanics, they try for the ''third'' time and it still fails to go into light speed because the Empire had deactivated it! The twist is that R2-D2 fixes it in time for their escape.
*** C-3PO spelling out [[MillionToOneChance the ridiculous odds]] against whatever they trying to do. First he says that the odds of Han and Luke surviving a Hoth blizzard are 725 to 1. Then he says the odds of successfully navigating an [[AsteroidThicket asteroid field]] are 3720 to 1 (prompting Han to reply "NeverTellMeTheOdds!"). Finally, he tries to tell Han the odds of surviving a direct assault on a Star Destroyer, but Leia interrupts and shuts him down.
** The climactic battle in ''Film/ReturnOfTheJedi'' cuts between three different sets of action and location: the forest battle, the space battle and the duel between Luke and Vader in the Emperor's throne room. Also, just before his confrontation with Vader, Luke tells Leia, "The Force is strong in my family. My father has it, I have it... [[TheReveal and my sister has it.]]"
** In ''Film/AttackOfTheClones'' Obi-Wan, Anakin and Padme are held captive in the Geonosian arena and separately has to fight three different beasts, an Acklay, a Reek and a Nexu.
** In a more meta example, ''Film/TheForceAwakens'' is the beginning of a third trilogy of ''Star Wars'' films.
* ''Film/FightClub''. "That's three times you promised." On the Commentary Track, it's mentioned that this is a reference to Jesus being denied by Peter thrice.
* ''Film/{{Gremlins}}'': Oh, man, does the Rule Of Three apply here big time with the rules of caring for a mogwai. 1) Keep it out of bright light, 2) Do not let it get wet and 3) No matter how much it cries or how much it begs....never let it eat after midnight.
* ''Film/PansLabyrinth'' implements this [[FauxSymbolism in almost everything]] within the plot, as emphasized and confirmed by the [[WordOfGod director]] in DVD commentary, ranging from the number of a specific set of characters, towards the number of tasks the main character must accomplish.
* ''Film/UnfaithfullyYours'' had three fantasies over how the main character would deal with what he thought was his wife's adultery.
** When the character is trying to get a recording machine to work in "real life," as he fiddles with the controls, the machine's arm twice lifts the disc off and drops it to the side of the machine. The third time, when Alfred reaches out his hand to catch the disc, the machine instead ''flips it over and puts it back on the spindle.''
* In ''Film/{{Tapeheads}}'', the owner of Fuzzball Records tries to get the main characters to make him another video "on spec" (i.e. for free) by mentioning that "All good things come in threes." Josh retorts that it's not good things, but celebrity deaths, that come in threes.
* ''Film/RunLolaRun'' loops three times through the same series of events, with [[ButterflyEffect minor to snowballing changes]] in each iteration.
* Sherman Klump is asked a Triple in ''Film/TheNuttyProfessor'' remake:
-->'''Dean Richmond:''' Can I get you anything? Juice? Coffee? Rack of lamb?
* When Film/{{Goldfinger}} tries to kill Film/JamesBond with the industrial laser, he tells him, "The reason for our first two meetings is now clear to me. I do not intend to be distracted by a third."
* ''Film/TheDarkKnight''. The Joker twice does the "Wanna know how I got these scars?" line in a prelude to doing something nasty. The third time he's got Batman pinned.
-->'''Joker:''' You know how I got these scars?\\
'''Batman:''' No, but I know how you got ''these''! ''(shoots his forearm blades into the Joker's face)''
%%* Showing that it's not always good, it's used in ''Film/TriumphOfTheWill''.
* "Every magic trick has three parts or acts: the Pledge, the Turn and ''Film/ThePrestige''."
* In the DVDCommentary for ''Film/MeanGirls'', Creator/TinaFey sarcastically notes that the scene where Cady & co. are trying to arrange for Aaron to catch Regina cheating on him follows "the comedy rule of twos" and that there should really be a third method they try.
* Claudia does indeed try to kill Lilli three times in ''Film/SnowWhiteATaleOfTerror'', but the first two are different from the original fairytale. She first tries to bury her in a mine cave-in and secondly by making trees fall in the forest.
* ''Film/StarTrekIntoDarkness'': The {{Manly|Tears}} {{Single Tear}}s as shed by Kirk, Harrison, and Spock. Each from their left eye.
* With each videotape of ''Filmgore'' came a death certificate from the distributor, Force Video, promising that the first person to be scared literally to death by the picture as certified by three physicians would be buried at the distributor's expense.
* ''Film/CaptainAmericaTheWinterSoldier'': [[spoiler: Three heroes (Captain America, Black Widow, and Falcon) have to place data cards in the control centers of three Helicarriers secretly controlled by HYDRA. In a neat twist, instead of each hero inserting a card into one base, Falcon takes one while Cap takes the other two, and Widow goes undercover at the Triskelion to confront Hydra mole Alexander Pierce and unload all of SHIELD's dirty laundry on the Internet.]]
* In ''Film/TradingMom'', all customers at the Mommy Market are given only three tokens, no refunds.
* In the New Year's crab dinner scene in ''Film/TheJoyLuckClub'', Waverly scornfully rejects the advertising copy June has written for her company: "Oh, god. I mean, really, June. ''Three'' needs, ''three'' benefits, ''three'' reasons to buy, satisfaction guaranteed for today's and tomorrow's tax needs?!" Snobbish Waverly regards this as unsophisticated and unworthy of her "big firm".
* "What's that noise?" is the question asked three times at [[spoiler:Bergdorf's funeral]] by ''Film/Oceans11''. [[spoiler:They do ''not'' want to know the answer.]]
* ''Film/{{Annie|2014}}'':
** Annie: Her report at school. Her conversation with the social services clerk, and her failed speech at the Guggenheim.
** Sandy: Sandy barks, growls and runs in circles when upset or afraid. She does it when the bullies corner her. She does it in the pound. And she does it again [[spoiler: when Annie's "real parents" come for her]].
* In ''Film/ToKillADragon'', the Dragon has ''three'' heads, which can turn into ''three'' different people. Lancelot defeats the Dragon using ''three'' gifts from the townsfolk: a sword, an invisibility cap, and a balloon.
* In ''Film/StarTrekGenerations'', Kirk is dismayed to learn that the tractor beam, medical staff, and photon torpedoes won't be brought aboard the newest ''Enterprise'' until Tuesday.
* ''Film/AmericanBeauty'' does this when Lester is trying to seduce Angela. The first time, she reaches for a drink and there are three quick cuts. The second time happens when [[spoiler: Lester takes off Angela's jeans]].
* In ''Film/StrokerAce'', Stroker finds out that Pembrook is passed-out drunk on his bed. He goes to leave three separate times only to pop back into the frame and justify undressing her. After the third time, he comments to her that [[BlackComedyRape he could have his way with her, and she would never know]] and follows it by giving [[AsideGlance the audience]] a suggestive look.
* ''Film/{{Dredd}}''. Judge Dredd is training rookie Judge Anderson, and on three occasions asks her, "Are you ready?" The first two times her affirmative response earns a skeptical look or the comment that she doesn't look ready. Third time, after she's gained his respect, Dredd notes with approval, "You look ready."

* A joke in 2009 uses the Rule Of Three to explain the three close celebrity deaths that year.
-->[[http://en.wikipedia.org/wiki/Farrah_Fawcett Farrah Fawcett]] died and went to heaven. Saint Peter said "You were very good on Earth, so you have been granted one wish." Farrah thought for a bit and said "I wish for the safety of all children on Earth." Half an hour later, Music/MichaelJackson arrived in heaven.\\
Michael Jackson was surprised to find himself in heaven, but even more surprised that he was once again black. "Saint Peter," he said, "I worked pretty hard to lighten my skin over the years. Can you fix it?" Half an hour later Creator/BillyMays arrived in heaven with some [=OxiClean=].
* Jokes in general tend to make very heavy use of the Rule Of Three, especially those following the "Blonde/Brunette/Redhead" or "Nationality/Nationality/Nationality" formula.
* The sarcastic {{snowclone|s}} "My (whatever) is (good thing), yours is (not so good thing), his is (even worse thing)."

* In ''Literature/{{Beowulf}}'', Beowulf fights three monsters: Grendel, Grendel's mother, and the Dragon.
* ''Literature/{{Discworld}}''
** The witches coven in Lancre consists of the Maiden, the Mother, and the... er, [[TheHecateSisters Other One]], much to Granny Weatherwax's indignation.
** Tiffany Aching's attempt at making a shamble (sort of a witch's Swiss Army Knife). Makes one... fails. Makes another one... fails. On her third attempt, [[spoiler: she fails again, and realises that it was stupid to rely on the rule of three, since things don't happen like that in reality.]]
** There's also troll counting, which appears to go by threes:
-->One, two, many, many-one, many-two, many-many, many-many-one, many-many-two, many-many-many, LOTS!''
* "What I tell you three times is true", from ''Literature/TheHuntingOfTheSnark'' by Creator/LewisCarroll.
* In ''Literature/KingCrow'', the hero is visited by his corvid helper three times.
* "I tell you three times" is an override command to the supercomputer in the science fiction novel ''Literature/StandOnZanzibar'' (1968) by Creator/JohnBrunner.
* It's also the command for ''Gay Deceiver'' to store an instruction in permanent memory in ''Literature/TheNumberOfTheBeast'' (1980), by Creator/RobertAHeinlein. Based on the design philosophy that any machine or computer your life depends on should have triple redundant fail safes. The 'tell you three times' protocol was admittedly a lazy shorthand in violation of his own principle. Zeb demonstrated himself what a bad practice it was by using it to execute commands faster than they can be given consideration, whereas three honestly separate steps may have prevented him from jumping the gun.
--> "The [spaceship's] new computer was of the standard "I-tell-you-three-times" variety, a triple brain each third of which was capable of solving the whole problem; if one triplet failed, the other two would outvote it and cut it off from action, permitting thereby at least one perfect landing and a chance to correct the failure. -- ''Literature/TheRollingStones'' (1952)
* A story by Raymond F. Jones in the February 1951 issue of Astounding Science Fiction was titled "I Tell You Three Times", and related to computer controls.
* The absurdist HolyBook ''Literature/PrincipiaDiscordia'' is based on a Rule of ''Five'', which bleeds over into such works of Discordian fiction as ''Literature/{{Illuminatus}}''
* The alien race (dubbed the Ramans) that created the gargantuan space object in ''Literature/RendezvousWithRama'' by Creator/ArthurCClarke apparently do everything in threes -- triple motifs litter it. (It is implied they had three hands, and presumably also three legs). The last line of the novel uses this for a stinger. Years later, this fact served as a handy SequelHook for Clarke when he decided to let Gentry Lee write follow-ups.
* “Yet across the gulf of space, minds that are to our minds as ours are to those of the beasts that perish, intellects ''vast'' and ''cool'' and ''unsympathetic'', regarded this earth with envious eyes, and slowly and surely drew their plans against us." (H G Wells 1898 Literature/TheWarOfTheWorlds, opening paragraph). "How beautifully underplayed is that adjective ‘unsympathetic’." (Creator/BrianAldiss, Trillion Year Spree p. 152).
* ''Literature/{{Stardust}}'': The King of Stormhold has three remaining sons. Also subverts the youngest brother convention by making him pure evil, and the oldest a caring and decent man. The middle brother is a useless sex maniac. The youngest son is also the Seventh Son. Also subverted in the film in that the King has four remaining sons. One is TooDumbToLive, and is quickly pushed out of the tower by his brother, who has an eye for opportunity.
* ''Literature/TheHobbit'': "Third time pays all."
** Other Tolkien examples: there are three [[Literature/TheSilmarillion Silmarils]], three Elven [[Literature/TheLordOfTheRings Rings of Power]], three races that got Rings of Power, three groupings of Elves of the Light, three ancient tribes of noble Men, three archaic clans of Hobbits, and three survivor states of Númenor (Arnor, Gondor, and Umbar). [[BigBad Melkor]] disrupts the Music of the Ainur thrice. Galadriel refused Fëanor's request for a lock of hair thrice, and in The Lord of the Rings gives Gimli three hairs when he asked for just one.
** There are also nine Nazgûl. Nine is thrice three, and a very important number in Myth/NorseMythology.
* Dennis Dutton might have some good points about the flaws in Christopher Booker's ''Literature/TheSevenBasicPlots''[[http://denisdutton.com/booker_review.htm]], but he really shows his ignorance of tropes when he tries to attack Booker's use of the Rule Of Three:
-->'''Dutton''': ...while there are three bears, three chairs and three bowls of porridge in Goldilocks and the Three Bears,* there are actually four characters. The story would better support Booker* s theory were it "Goldilocks and the Two Bears".
* In ''Literature/AChristmasCarol'' by Creator/CharlesDickens, the Ghost of Christmas Past and the Ghost of Christmas Present do not change Scrooge's mind. It is the third ghost, the Ghost of Christmas Yet To Be, who convinces Scrooge to change his ways.
** Not entirely true. By the end of the Ghost of Christmas Present's visit, Scrooge is shown a pair of [[StreetUrchin street urchins]] freezing to death and shows compassion for them, only to have his earlier harsh words thrown back in his face. The Rule Of Three still applies to the story structure, though.
** Only in certain movie adaptations. In the original story Scrooge is slowly repenting of his ways from the very first ghost, and has fully repented by the end of the second. He even begins his time with the third by stating that he is a different man than he was, and is eager for the spirit to guide him further. Unfortunately, the Ghost of Christmas Yet To Come isn't the friendly sort.
** In a 2000 television adaptation starring Ross Kemp, re-telling the story in a modern London estate, the Rule Of Three applies even more -- Eddie Scrooge is stuck in a GroundhogDayLoop, as after each spirit he gets to re-live Christmas Eve again and try to change things. After the first spirit, he hasn't changed a bit. After the second, he's becoming a better person but is still arrogant [[spoiler: his showing off the "new" him to his nurse ex-girlfriend results in a young homeless person dieing, as he went to get his ex rather than simply call an ambulance to help the person]]. After the third ghost, [[spoiler: he changes his ways for real and does kind acts without showing off -- including calling an ambulance for the homeless person]]. Also, Rule Of Three applies even more than the ghosts. The Ghost of Christmas Past is Eddie's father, the Ghost of Christmas Present is Jacob Marley himself and the Ghost of Christmas Future is [[spoiler: the son he could have if he changes his ways]].
* In Dante's ''[[Literature/TheDivineComedy Inferno]]'', {{Satan}} has three faces, eternally chewing on Judas, Brutus, and Cassius. Also, Hell, Purgatory, and Paradise all have 9 levels, grouped into threes. In Hell, three circles apiece are devoted to sins of Incontinence, Violence, and Fraud; in Purgatory, atonement is performed for sins that involve Bad Love (Pride, Envy, and Wrath), too little love (Sloth), and too much love (Avarice, Gluttony, and Lust); and in Paradise, saints dwell in nine concentric spheres that surround the Earth, beyond which God lives. ''Literature/TheDivineComedy'' actually contains many examples of the Rule of Three, and other numerology. For instance it is usually divided into three parts (Inferno, Purgatorio and Paradiso) of 33 ''canti'' each plus a prologue.
** The play itself is composed of Terza Rima.
* In ''Literature/TheDresdenFiles'' books, all fae are bound by whatever they say 3 times. Harry mentions it several times throughout the books.
** Commands and denials also work in threes.
*** The Goats Gruff are a subversion of the rule in Dresden, and it surprises him greatly.
*** The first goats gruff were quite small and attacked him at Michael's.
*** The second goats gruff were adult human sized, and attacked with Uzi's.
*** The third goat gruff was huge and fought by himself.
*** Eldest gruff was fairly small and wizened, but an extremely competent wizard/sorcerer in his own right.
*** In Cold Days, Harry commands an entity using his own name 3 times, to reveal itself.
*** That entity itself is part of a trio.
*** In earlier books and his dealings with the Denarians, Harry denies them three times. On days when he's stressed and tired, the exchange works as "Reasonable request" from the Denarian, followed by Harry saying "No, no, no for a third time."
** Also, there are three main Vampire Courts (not counting the one in Asia). As of the most recent books, [[spoiler:apparently Harry caused the extinction of the entire Red Court of vampires]].
*** Well, after the events in ''Changes'' [[spoiler:the destruction of the red court vampires resets it to three vampire courts.]]
*** Also the White Court is composed of three major houses.
** The Summer and Winter factions of the fae are each ruled by a Queen, a Lady, and a Crone. Also there are Three factions of Fae: Winter, Summer, and the Wyld Fae.
** There are Three Knights of the cross, with their three holy swords.
** The events of dead beat involve three [[spoiler:necromancer disciples of Kemmler]] trying to find [[spoiler:the word of Kemmler]].
* In ''Literature/TheNeverendingStory'' Atreyu must pass three gates to reach the southern Oracle. (In the movie the third gate is left out and the first replaced with one that shoots laser beams. duh.)
* Several examples in the ''Literature/HarryPotter'' canon:
** Harry, Ron, and Hermione form a PowerTrio, whilst Malfoy is always flanked by Crabbe and Goyle. In the seventh book, Luna, Neville, and Ginny make up their own trio.
** The Triwizard Tournament is traditionally disputed by three champions, but in the fourth book it's subverted since Harry is an unexpected and unprecedented fourth competitor.
** The founders of three of the four houses welcome students of all types (the fourth one abandoned the school and left a monster as a parting gift because he wanted it to be pure bloods only); in the seventh book, students from three of the four houses are LaResistance and hiding in the Room of Requirement (the fourth one is LesCollaborators and can't or won't join them), three of the four founders had their possessions made into Horcruxes, whereas the fourth owned something that can destroy them, and three of the four houses are seen fighting in the Battle of Hogwarts (the fourth is sent to the dungeons, although their head professor does battle).
** The prophecy that intertwines the fates of Harry and Voldemort has this passage: "...Born to those who have thrice defied him, born as the seventh month dies --"
** The symbol of the Deathly Hallows (Of which there are three) is triangular. The Hallows are: the Resurrection Stone, the Invisibility Cloak, and the Elder Wand. They were created by the three Peverall brothers: the eldest was killed for the wand, the middle killed himself to be with his dead wife, and the youngest lived to old age by "hiding from Death" with the cloak. In the movie the first two brothers are mostly silhouettes while the third brother is (more or less) fully lit.
** There are three significant incidents where Harry violates, or is accused of violating, a law against using magic during the holidays while underage. The first time, Dobby does it to embarrass him in front of his Uncle Vernon, who proceeds to lock him in his room using his connections after Harry ends up with a warning letter regarding the incident. The second time, Harry does so in an unconscious reaction to a YourMom joke from Aunt Marge, only for the Minister of Magic himself to let it slide on the grounds that a manhunt for an alleged dangerous wizard is currently taking place. Only the third time, when Harry summons his Patronus to protect his cousin Dudley from Dementors [[spoiler:sicced upon them by Dolores Umbridge]], [[NoGoodDeedGoesUnpunished does he get into any real trouble for it]], but he's bailed out at his trial by none other than Dumbledore, whose defense of him plays a major role in his acquittal on all counts.
* In Creator/DanAbnett's Literature/GauntsGhosts novel ''Only In Death'', "A traditional Tanith toast took three parts." So Larkin and Rawne toast "Old Ghosts," "Staying alive," and "Ibram Gaunt".
* In the classic MSTing of ''Literature/TheEyeOfArgon'', [[http://www.bmsc.washington.edu/people/merritt/books/Eye_of_Argon.html Mike and the bots]] riff:
-->Mike: When I think of wisdom, I think of three names: Solomon; Creator/{{Confucius}}; Grignr.
* In one of Creator/MercedesLackey's novels, a new magic user of Native American heritage was surprised he had to do something 4 times where the Europeans were equally bound to do the same thing 3 times. The 4 directions, donchaknow!
* ''Literature/RomanceOfTheThreeKingdoms'' didn't stop at the title for this one:
** The best known example would be the three heroes Liu Bei, Guan Yu and Zhang Fei, who not only became best friends but blood brothers.
** Liu Bei would later have to make three separate visits in order to convince the tactical sage Zhuge Liang to join them.
** Guan Yu would later become leader of his own three man team, with Guan Ping and Zhou Cang.
** Averted with Sun Quan, who's leading a nation while burdened by a legacy left behind by his father Sun Jian and elder brother Sun Ce, both of whom are dead. His close confidante Zhou Yu and sister Sun Shangxiang may constitute a new three in formation.
* Creator/GuyGavrielKay's ''Literature/TheLastLightOfTheSun'' features an in-character subversion. Alun ab Owyn, who comes from a culture that is very big on the Rule of Three, hears a creature roar two times. When it doesn't roar a third, he's surprised, until he realizes that triads are a human invention, and unrelated to ancient monsters.
* The ''third'' ''Literature/{{Warrior Cats}}s'' series is called ''[[Literature/WarriorCatsPowerOfThree Power of Three]]'', and has ''three'' protagonists.
** And their names have ''three'' syllables each.
** Featuring ''three'' chosen ones. [[spoiler: Although there turns out to be a fourth.]]
* In ''Literature/TheNightAngelTrilogy'' lessons at The Chantry (a women's school of magic) are taught in threes, supposedly for ease of recall.
* The concept of book trilogy to begin with. A notable example is ''Literature/TheLordOfTheRings''. ExecutiveMeddling is what caused that one to be three books, though. It's just one novel, internally divided into six books. And mocked by the 'ever increasingly misnamed ''Literature/TheHitchhikersGuideToTheGalaxy'' trilogy'' (six books).
* In a Sci-fi story "a little lubricant" (yes, ahoi DoubleEntendre) the ''third'' spaceship makes it back to Earth.
* The entirety of Wil [=McCarthy=]’s novel ''Literature/TheCollapsium'' is structured this way. It’s broken into three “books,” ''Once Upon a Matter Crushed'', ''Twice Upon a Star Imperiled'' and ''Thrice Upon a Schemer’s Plotting'', and each begins with a nearly identical setup and set of challenges for the main character. But with each iteration, the complexity of the story takes a step up, until the final section, where everything goes to hell and plot threads from all three sections pay off. By the [[WordOfGod author’s own admission]], the novel was written as a modern hard-SF fairy tale, so Rule Of Three is used ''very'' deliberately.
* Lampshaded and made an explicit magical rule in the ''Literature/PercyJacksonAndTheOlympians'' books, where the number three is sacred (three Furies, three Fates, three sons of Kronos atop three thrones), and so Half-Blood heroes going on quests are allowed only two companions. Breaking this is seen to invite trouble.
* Creator/DianaWynneJones's book ''Literature/PowerOfThree'' has this in spades, unsurprisingly. The main characters are three siblings; there are three peoples living on the Moor -- Lymen, Dorig and Giants; there are three Powers, Sun, Moon and Earth. The children's father performed three tasks to win their mother, and there are three exchanges of gold collars before the conflict between the peoples can be resolved.
* In ''Literature/BeyondTheWall'' by Ambrose Bierce, Dampier heard a knocking on the wall three times. The firs time he was skeptical, the second time he answered the knocking, the morning after the third time he was discovered dead.
* Three by Ted Dekker?
* ''Literature/MobyDick'' has three threes: The chapter ''The Chase -- Third Day'' marks the end of the book. Furthermore, there are three mates aboard the Pequod, Starbuck, Stubb and Flask; and three harpooners, Queequeg, Daggoo and Tashtego.
* In Creator/GrahamMcNeill's TabletopGame/{{Warhammer 40000}} Literature/{{Ultramarines}} novel ''The Killing Ground'', the Grey Knights subject Uriel and Pasanius to three tests of whether they are tainted.
* In Creator/JamesSwallow's ''Literature/BloodAngels'' spinoff story "The Returned", Tarikus is subjected to three tests of whether he is tainted. They are explicitly billed as tests of his mind, body, and soul.
* The title character of Paulo Coelho's ''Literature/TheAlchemist'' believes that anything that happens twice WILL happen again. He is not proven wrong.
* {{Lampshade|Hanging}}d in Creator/SergeyLukyanenko's ''Literature/TheStarsAreColdToys'' by an alien living computer who wonders about the human fascination with the number three. The humans are stumped, and the best explanation they can come up with is "two is not enough, and four is too much." Surprisingly, the alien is satisfied with the answer.
* In the ''Literature/StarTrekDeepSpaceNineRelaunch'', the number three appears to have considerable significance for the cultures involved with the Wormhole Aliens; the Eav'oq, the Bajorans, and the Ascendants (who themselves make three, obviously). Connected to this, we have the trio of the Voice, the Hand and the Fire. Further, there are nine orbs (three times three), and nine Emissaries. The Wormhole Aliens certainly like the number three, though for what reason (other than this trope) is as yet unclear. Finally, the Hebitians, a race of Precursors on Cardassia, also demonstrate a great love of the number. This may not be coincidental; frequent hints that Hebitian culture is connected to that of the Bajorans suggest we have a whole interconnected spiritual community valuing the rule of three.
* ''Literature/ASongOfIceAndFire'''s ArcNumber is usually seven, but the Rule Of Three still pops up a few times.
** Jaqen H'ghar owes Arya three [[IOweYouMyLife life debts]], and in true folktale fashion she wastes the first two on trivial vendettas and [[GuileHero makes creative use]] of the last one to get what she really wants.
** Runs deep in the Danaerys chapters. She's the last of three children, she has three dragon eggs, three handmaids, and three bloodriders, etc etc. When she is scouting out from Vaes Tolloro, she sends each of her three bloodriders in a different direction. The first two come back empty-handed, the last one takes a long time but ultimately returns with three emissaries from Qarth, a city ruled by three major guilds...
** Daenerys is betrayed thrice, and later on attacks three cities before settling down in the third.
** Amongst the Night Watch, three blasts on the horn is the ultimate OhCrap signal: [[EldritchAbomination The Others]] are coming.
** King Stannis's supporters chant "One god! One realm! One king!" which sounds like the old French slogan "One king, one law, one faith" or the UsefulNotes/NaziGermany slogan "Ein Volk! Ein Reich! Ein Führer!"
* Speaking the name of Hastur in the Franchise/CthulhuMythos.
* In Teresa Frohock's ''Literature/MiserereAnAutumnTale'', Lucian denies Catarina three times. Rachael specifically points this out to Caleb: It's important.
* In ''Master of Five Magics'' and its sequels, sorcerers must recite a spell three times to make it work, and each recitation is more difficult to enunciate than the last.
* ''Literature/{{Twilight}}'':
--> '''Bella:''' About three things I was absolutely positive: First, Edward was a vampire. Second, there was a part of him, and I didn't know how dominant that part might be, that thirsted for my blood. And third, I was unconditionally and irrevocably in love with him.
* The second ''Literature/DeltoraQuest'' series has the Piran Pipe which is divided into three pieces among the three tribes following their favourite candidate for their leader ''The Piper''. They conveniently find three different islands under the earth to live in. There's also Lief, Barda and Jasmine (the PowerTrio).
* In Creator/DevonMonk's ''Literature/DeadIron'', [=LeFel=] tries to invoke this on Jeb Lindson -- he shouldn't have to kill him more than three times.
* Though the Winds worshiped by the [[OurDragonsAreDifferent Kantri]] number four, the Lady Shia worshiped by humans of ''Literature/TalesOfKolmar'' has [[TheHecateSisters three aspects]] of the same being. At the end of ''Song in the Silence'', Lanen thinks she has to deny Akhor three times in order to save him.
* Humorous uses of this rule in the ''Literature/AuntDimity'' series include people having to get Lori's attention by saying her name three times, each one progressively louder (Dimity has to write her efforts, the third and last one in ALL CAPS). Also, in the fire alarm farce late in ''Aunt Dimity and the Family Tree'', among those gathered in the entrance hall of Willis Sr.'s house is an elderly woman who sees no need to evacuate since she lit the fire in question. Willis Sr. steps forward to inquire who she is, and the Donovans burst in:
--> "Aunt Augusta!" Deirdre cried.\\
"Aunt Augusta?" said Willis Sr.\\
"Aunt Augusta," Declan said, with a weary sigh.
* Creator/IsaacAsimov
** [[ThreeLawsCompliant Three Laws of Robotics]].
** ''Literature/TheGodsThemselves'' has several instances of this. Asimov wrote this novel because of complaints that his stories never featured aliens or sex; so he wrote a story full of [[BreadEggsBreadedEggs aliens, sex, and alien sex]]. The novel has three parts, the aliens are trigendered, and the first two parts end with somebody despairing that the short-sighted and selfish actions described will doom our universe. [[spoiler:The third part resolves the crisis by finding a way to avert this.]]
* ''Literature/TheKingkillerChronicle''. Though seven is really the ArcNumber of the series, 3 also carries some import:
** Giving three gifts to a tinker often heralds good fortune. Heroes in stories often receive three gifts from tinkers/benefactors.
** There is an idiomatic expression "I am telling you three times" which conveys deadly seriousness.
** And of course: "There are three things all [[TitleDrop wise men fear]]"
* In ''Literature/FirebirdLackey'', Ilya encounters the Katschei three times, and the third time kills him.
* The fourth ''Literature/MaryPoppins'' book begins by telling readers to regard the stories within as {{Interquel}}s to the first three books, because "three is a lucky number."
* In Creator/AletheaKontis's ''Literature/{{Enchanted}}'', it's Sunday's third kiss that qualifies as TrueLovesKiss.
* In Creator/SeananMcGuire's ''Literature/OctoberDaye'' novel ''Rosemary And Rue'', when Toby is contemplating a key that leaves her with a murder without a motive, a curse without a cure, and a key without a lock, she thinks of the importance of threes to the fae.
* ''Literature/TheThreeMusketeers''; except there's actually four of them after the protagonist joins the original trio.
* ''Literature/TheTripods'' series has the Masters with a lot of threes-three legs, three tentacles, three eyes, plus the eponymous three-legged vehicles and their three domed cities. In the television series, the caps are shown as three-sided/triangular as well. There are also three protagonists most of the time. Will is always the main character, but at first, he's traveling with his cousin, Henry, and Jean-Paul/'Beanpole', the boy they meet in France. Later, Will, Beanpole and another boy, Fritz, become the more important trio (though Henry returns in the climax).
* The three doors in ''Franchise/TheDarkTower'' book ''Literature/TheDrawingOfTheThree'', plus the three [[spoiler: [[SplitPersonality personalities]] within the body of Odetta: Odetta Holmes herself, Detta Walker, and, finally, Susannah Dean.]]
* Creator/MichaelFlynn's Literature/SpiralArm novel ''On the Razor's Edge'' opens with the observation that it starts with three, because in these matters there are always three.
* In Creator/RebeccaLickiss's ''Literature/EccentricCircles'', Malraux cheerfully explains why there are three of them -- the youth, the father figure, the old geezer.
* In ''Literature/StrangerInAStrangeLand'', the Martians have a number system based on powers of three; they also have three stages of life.
* In one Creator/DamonKnight story, one of the protagonists hires himself three bodyguards because "one cannot be trusted; two would probably conspire; but three can, with a minimum of effort, be kept in a state of mutual suspicion".
* In the ''Literature/RainbowMagic'' series, Special Edition books have three magical objects to find.
* ''Literature/TheHungerGames'': Suzanne Collins loves her powers of three. There are three books. Each book is divided into three parts. Each part contains nine (3x3) chapters.
* In Edward Ormondroyd's ''Time at the Top'' Susan Shaw receives three trips to the past after helping an elderly woman. Since said woman vaguely mentioned that she gets "only three" without specifying three ''what'', she initially wonders if she's been granted ThreeWishes.

[[folder:Live Action TV]]
* It seems like standard procedure for the parents in a DomCom to have three children. ''Series/TheBradyBunch'' (twice over,) ''Series/GrowingPains'', ''Series/HomeImprovement'', ''Series/{{Roseanne}}'', ''Series/TheNanny'', ''Series/FullHouse'', ''Series/{{Reba}}'' all involve the three children of the protagonists. The common reason seems to be that it covers all bases; the oldest can have typical teen problems (dating, driving, etc.), the middle can have the kid problems (first day of school, etc.), and the youngest can either sit and look cute or say random funny things. The big reason for the CousinOliver is to bring in another cute one when the child actors have the audacity to age and upset this delicate balance.
* ''Series/TheDailyShow''.
** Subverted on more than one occasion:
--> '''Jon Stewart''': I know comedy typically comes in threes. We threw that fourth one in there because we like to fuck with the ''structure''.
** Also subverted in a running gag on the [[http://www.thedailyshow.com/watch/thu-november-10-2011/indecision-2012---mercy-rule-edition November 10, 2011 episode after Rick Perry's infamous "oops" moment during the Republican primary debate]]. Throughout the first segment Stewart begins listing things in threes, but fails to come up with a third item to complete the list.
--> '''Jon Stewart''': So that leaves three people: Jon Huntsman, Rick Santorum, and... uh.... the Transportation Department? I don't know....
* Subverted by Johnny Carson on one episode of the Johnny Carson Show.
--> '''Johnny''' (reading a list of things he forgot to do in order of most recent to oldest): Call Marilyn Monroe to ask her to a dance...Call Marilyn Monroe to ask her to a movie...call Marilyn Monroe to ask to take her to dinner...remember to get Marilyn Monroe's phone number.
* "Hi, I'm Larry. This is my brother Daryl, and this is my other brother Daryl."
* ''Series/GameOfThrones'':
** Daenerys is the third of the three children of Aerys Targaryen, hatches three dragons, conquers three slaver cities, settling in the third, and her house sigil is a three-headed dragon.
** Ramsay casually shoots two arrows at Rickon, missing both times. Then he draws a third arrow and takes careful, deadly aim. It misses as well, subverting the trope. A fourth arrow that we didn't see him draw hits and kills Rickon.
* When Creator/TinaFey hosted ''Series/SaturdayNightLive'', she was coached on acting by guest star Steve Martin, who slapped her early in the monologue for her self-doubt, then slapped her again later just for fun, and then one more time immediately afterwards.
-->'''Tina:''' Was that one for fun too?
-->'''Steve:''' No, that was the Comedy Rule of Three.
* ''Franchise/StarTrek'' captains (especially Picard) would frequently list off [[FamousFamousFictional three examples of some well-known cultural phenomenon]]. Typically, two of them would be what we would consider "classic" examples, and one would be either contemporary to us, or alien. For example, he might say, "Ah, yes, the great poets of history; William Shakespeare, Walt Whitman, Zyglorty Mospiqxot of T'pingnit." Or, "I've always been interested in classical music; Bach, Beethoven, the Beatles." (''Series/RedDwarf'' did this precise gag with "Mendelssohn, Mozart, Motorhead".)
** This tendency wasn't lost on the writers of ''Series/MysteryScienceTheater3000'', who'd spoof it on a regular basis.
--->'''Crow (in Kirk's voice):''' We have had many wars like this in our own history. Our Civil War of Earth. Our World War one and two. Our Krinkleganglium Wars of Kromulon Thirteen...
*** One episode of ''Series/StarTrekTheNextGeneration features this joke from a man claiming to be a historian from the 26th century. Talking to Geordi, he mentions several blind artists by surname, ending with (Stevie) Wonder. On rewatching this episode, one realises that this is meant to be a clue that he isn't from the future but from the 200 years in the past.
*** When ''Series/StarTrekTheNextGeneration'' the Enterprise got caught in a time loop, [[GroundhogDayLoop reliving the same day over and over]] -- and that day always ended with the destruction of the Enterprise. Eventually they caught onto this and decided to program a message into Data's brain to be sent back into the rift on the next iteration, and hopefully help them avoid the collision that got them caught in the rift in the first place. During the next go-round, the number three continually appeared throughout the day (Data was subconsciously repeating the pattern) until the time of the collision came again. Left with two choices about how to avoid the accident (one suggested by Data, and one by Commander Riker), they noticed that ''three'' could refer to the number of rank insignia on Commander Riker's lapel. Therefore Riker's was the right idea, not Data's.
** The main PowerTrio of [[TheKirk Kirk]], [[TheSpock Spock]], and [[TheMcCoy McCoy]] in the Original Series.
** A gag from the Original Series episode [[Recap/StarTrekS2E15TheTroubleWithTribbles The Trouble With Tribbles]]:
---->'''Kirk''': You'll do it?\\
'''Spock''': He'll do it.\\
'''Cyrano Jones''': I'll do it!
** And to top it off in the grand finale of [[Series/StarTrekEnterprise Enterprise]] has the three Enterprise Captains speaking the "these are the voyages" narration while the three Enterprises appear on the screen.
* In ''Series/{{Blackadder}} II'', the title character seeks the help of a wise woman when he falls in love with his manservant, 'Bob' (who, unbeknownst to Blackadder, is actually a girl in drag). She suggests three "cunning plans": first, he could kill Bob. When he rejects this she suggests he could kill himself, which he's no keener on. The third plan is to ensure nobody else ever finds out: "kill everybody in the whole world!" And in the episode "Major Star", Captain Blackadder gives Lieutenant George three rules to follow during his drag-date with General Melchett: 1) Never remove your wig. 2) Never say anything. 3) Don't get drunk and let him shag you on the veranda.
* In the ''Series/{{Lost}}'' episode "The Moth," Locke tells Charlie he will give him his heroin back only on the third time Charlie asks for it. On the DVD commentary, the writers and Dominic Monaghan joke that Charlie could have just said, "Give me my drugs, give me my drugs, give me my drugs."
** The first two times Charlie asks for his heroin, he wants to use it. The third time he asks is after his epiphany during the cave-in, and this time he only wants it so he can destroy it for good.
* Subverted (as is almost everything) on ''Series/SheSpies''; Cassie and Shane each offer one possible, lightly humorous, explanation for an occurrence and then DD offers a third one, no funnier than the first three. The other two girls stare at her and she declares, "The third one doesn't always have to be funnier, you know!"
* ''Series/{{House}}'':
** There's the episode ''Three Stories'' which is ExactlyWhatItSaysOnTheTin although the stories begin to intertwine and House is trying his best to confuse the medical students about what story they are currently listening to.
** In seasons 1-3, House's diagnostic team consisted of three members: Foreman, Cameron, and Chase.
* ''Series/BabylonFive'' has this all over the place:
** The Minbari have three castes, the ruling body consists of three individuals from every caste so 3 times 3, three languages, the most holy artifact is a triangle -- and they have three of them)
** Also, the Vorlon epigrams "Understanding is a three-edged sword" and "There are three sides to every question: your side, their side, and the truth"
* ''Series/HowIMetYourMother'':
** In the second episode of the series ("Purple Giraffe"), Ted throws three consecutive parties because he wants to "casually" talk to Robin, who happens not to be able to come at the two first ones.
** The time Barney kept getting angry, storming out of the bar to a full dumpster, and then smashing a TV. The third time the dumpster had already been emptied, he went to an electronics store, purchased a TV, brought it back to the alley, and smashed it.
** Barney even has a rule based on this trope telling Ted to wait three days before calling his {{Girl Of The Week}} and claims it was invented by Jesus when he waited three days before his resurrection. Ted agrees to wait three days, [[ExactWords but notes that rule doesn't say anything about texting.]] [[spoiler: However, he was unknowingly texting Marshall and Barney after Barney secretly switched the girl's phone number with his own on Ted's phone.]]
*** This rule was [[{{Subversion}} subverted]] as Future!Ted reveals to his kids that when he got the eponymous Mother's phone number he called her straight away.
* ''Series/{{Charmed}}'': "The power of three will set us free! The power of three will set us free! The power of thee will set us free!"
* ''Series/TheBigBangTheory'':
** (knock knock knock) Penny! (knock knock knock) Penny! (knock knock knock) Penny!
** (knock knock knock) Leonard and Penny! (knock knock knock) Leonard and Penny! (knock knock knock) Leonard and Penny!
** Another ''Series/TheBigBangTheory'' example, when Sheldon saved Leonard from a rocket fuel explosion in the elevator.
-->'''Leonard:''' I was just glad that Sheldon didn't rat me out to the Landlord. ... Or to the police. ... Or to Homeland Security.
* Countless game shows have three contestants per episode. ''Series/{{Jeopardy}}'' and ''Series/WheelOfFortune'' are the best known.
* Nearly every joke on ''Series/DesperateHousewives'' follows this trope. All of Mary Alice's narratives will contain 3 examples followed by the main point.
* The three presenters on ''Series/TopGear''. This works well, as two of them can set up a pattern and the third can break it [[RuleOfFunny for humor]].
* Lampshaded on an episode of ''Series/{{NCIS}}'':
-->'''Director Vance:'''...And the third?\\
'''[=McGee=]''' How did you know there was a third?\\
'''Director Vance:''' There is always a third.
* {{Discussed|Trope}} on ''Series/NCISLosAngeles'', when Deeks makes the requisite "Gesundheit" joke after someone says a weird-sounding German name... twice, and the others all just stare at him. [[spoiler:Sure enough, it came up a third time, and Callen seemed to think it ''was'' good.]]
-->'''Deeks:''' Rule Of Three. The third time will be hilarious.
* ''Series/GilmoreGirls'': I wish my mom would let me have a car... or a bike... or my roller skates back.
* ''Series/GoOn'': [[OneSceneWonder Anne's girlfriend]] plays with this: "I may not know a lot about books, or movies, or third things to end lists with..."
* ''Series/KamenRiderOOO'' has threes in everything. Three sets of three Core Medals per Greeed, three part forms for the hero, three part [[IdiosyncraticEpisodeNaming episode titles]]. The main characters themselves -- Eiji, Ankh, and Hina -- make up a trio. Each PreviouslyOn segment has "These three things happened on the last ''Kamen Rider OOO.'' The TransformationTrinket is even threefold (medals, scanner, driver.)
* [[InvokedTrope Invoked]] by Series/{{Sherlock}}. He lampshades the fact that people expect things to happen in threes, so [[spoiler:he hid a fourth listening device in his hospital room]].
* In an early season of ''Series/WalkerTexasRanger'', in the first episode of the season, Walker corners the bad guy at the end of the episode. The bad guy turns and faces Walker, assumes a "karate stance" and makes a "karate yell". Walker beats him up. In the next episode, different bad guy, same ending. In the third episode, same ending except just when you are saying "this is getting a bit old", Walker drops his shoulders, sighs and says "Not another karate guy."
* ''Series/{{Community}}'' has Britta's one-time boyfriend Vaughn, who always says hello three different ways.
--->'''Vaughn:''' Hey. What's up, man? Hi, Bro.
** This is then {{lampshade|Hanging}}d by the study group, who start to count his greetings on their fingers whenever they see him.
* ''Series/ICarly'' uses this extensively.
** In "[=iSaved Your Life=]":
-->'''Freddie''': "My mom thinks I'll choke on pills so she pounds them with a mallet and puts them in my fruit sauce.\\
'''Spencer''': Fruit sauce?\\
'''Freddie''': My mom thinks I'll choke on fruit so she pounds it with a mallet--\\
'''Spencer''': Okay yeah, we get it.\\
'''Spencer''': What happened to those flowers?\\
'''Mrs. Benson''': I soaked them in bleach and then pounded them with a mallet!
** In "iQuit iCarly", after Sam & Carly have been pulled inside the building, they burst into tears and Spencer turns them to face one another so that they hug, whilst Fleck & Dave do the same thing. Spencer & Freddie look at each other & shrug, before hugging.
* ''Wizard of Earthsea'': the wizard Ged knows the Dragon's true name and has Power over him.
-->'''Dragon:''' Very well, little mortal, ask your two questions.\\
'''Ged:''' Hey! Don't I get to ask '''three''' questions?\\
'''Dragon:''' Yes, you do. Now you have two questions left.
* The 2nd ''Series/CriminalMinds'' episode, "Compulsion", features a serial arsonist/murderer driven by an obsessive-compulsive disorder that forces her to repeat things in sets of three. When (pretty arbitrary) patterns of threes emerge around her it triggers her to start her next round of arson and murder.
* The Trinity Killer in ''Series/{{Dexter}}'' Season 4. 3 sets of kills spanning 30 years. [[spoiler: It turns out he actually kills in sets of 4, but this wasn't discovered as the bodies of the first bodies of every cycle were never found.]]
* This was actually very prominent in ''Series/TheSopranos''. Junior superstitiously believes that it applies to real life, going so far as to hope that his old friend dies of cancer because... two of his friends have died of cancer already, and if a third meets the same fate, he'll be off the hook. Obviously cancer only targets three people of a given generation, right? It also plays into fan theories regarding the finale. Virtually every detail of the final scene evokes the number 3: there are 3 Sopranos at the table, there are 3 pictures on the wall, Meadow is able to successfully parallel park on her 3rd attempt. This brings Junior's "these things happen in 3s" theory to mind, suggesting that Tony really does die at the end to complete the trio that started with Bobby and Sil.
* ''Series/ThirtyRock'':
** Lampshaded in the episode "Hey Baby, What's Wrong" by dr Leo Spaceman, after the second of three of Jenna's examples of what pressure means to her.
** Another episode has Tracy afraid after two celebrities died fearing he may be next.
* On the US version of ''Series/BigBrother'', Boogie & Janelle have both competed 3 times, and three different Danielles have competed.
* ''Creator/MontyPython'':
** "Nobody expects the Spanish Inquisition! Our chief weapon is surprise...surprise and fear...fear and surprise.... Our two weapons are fear and surprise...and ruthless efficiency.... Our *three* weapons are fear, surprise, and ruthless efficiency...and an almost fanatical devotion to the Pope.... Our *four*...no... *Amongst* our weapons.... Amongst our weaponry...are such elements as fear, surprise.... I'll come in again."
** Three sketches in that episode involved the line "I didn't expect the Spanish Inquisition," which was the cue for Cardinal Ziminez and his followers to show up. The third time, they were running late and by the time they could declare, "Nobody expects the Spanish Inquisition!" the credits had rolled and the show was over.
* ''Series/TheBobNewhartShow'': Bob almost falls down an elevator shaft and realizes how easily he could die. He then invokes the "Death comes in threes" -- "First [=DeGaulle=], then Mao. I could be next!"
* Over the course of ''Series/TwentyFour'' there were in total three moments where a character that was part of that season's main cast was killed by a character that was another member of the main cast. These notably tied in with either the revelation that their murderer was really EvilAllAlong and/or that s/he was undergoing a FaceHeelTurn.
* In the ''Series/{{Bones}}'' episode "The Shot In The Dark", after an assailant shot Brennan, she found herself having visions of her late mother consoling and advising her. She ended up seeing her mother three times; once after she was initially shot, once after her body went into shock as a reaction to a mismatched blood-type (a key clue that the bullet that shot her was composed of [[AbnormalAmmo frozen blood]]) and once when she underwent voluntary exploratory surgery to find traces of the blood bullet that nicked her ribs, in order to link the blood bullet to her assailant.
* 1) Faster than a speeding bullet. 2) More powerful than a locomotive. 3) Able to leap tall buildings in a single bound. Look, up in the sky. 1) It's a bird. 2) It's a Plane. 3) It's ''Franchise/{{SUPERMAN}}''!
* One of the main storylines of the fourth season of ''Series/{{CSINY}}'' was the '333 killer', who always called Mac at 3:33 am or pm, always freaking him out.
* Shows up a few times in ''Series/BuffyTheVampireSlayer'' and ''Series/{{Angel}}''.
** An early ep had the Three, the warrior vampires sent by the Master to kill Buffy. They failed, and offered their lives as penance.
** Angel had the three Transcendent Furies, who Lorne paid to keep Caritas under the non-violence spell.
** When Cordelia's mind was opened to the world's suffering by a demon, she was cured by Wes's reading of the scroll the group stole from Wolfram and Hart, ending with saying the word 'unbind' three times.
** The Wolf, Ram, and Hart, the three factions or entities of Wolfram and Hart.
** In season three of ''Buffy'', when Angel has been poisoned by Faith and needs the blood of a Slayer to cure him, Buffy punches him to get him to vamp out. Of course, she hits him once, twice, aaand the third time does it.
** Spike knocks down the 'Welcome to Sunnydale' sign three times. Twice by driving his car into it, [[spoiler: the third time by using a magical amulet to destroy the Hellmouth and Sunnydale along with it. Subverted, because the first two are played entirely for humour where the third is a consequence of Spike's sacrifice. As the Scoobies look out over the crater that used to be their home, Giles asks, "I don't understand. What did this?" Buffy answers sadly, "Spike." Then the sign falls into the hole.]]
** From Season 9 of ''Buffy'':
--> '''Faith:''' "Brooding. Bad decisions. Violence. Rinse and repeat."
* ''Series/YesMinister'':
** Two notable interrelated jokes:
-->'''Bernard''': It's one of those irregular verbs, isn't it: ''I'' have an independent mind, ''you'' are eccentric, ''he's'' round the twist.
** Later:
-->'''Bernard''': ''I'' hold confidential briefings, ''you'' leak, ''he's'' been charged under Section 2A of the UsefulNotes/OfficialSecretsAct.
* ''WesternAnimation/BluesClues'' always uses three clues to solve the episodes' puzzle. It's even in the song.
* The 1978 HalloweenEpisode of ''The Lawrence Welk Show'' has the lead singer of "Put On a Happy Face" do this in a spoken word interlude: "Empty bag, empty hand, [[CloudCuckoolander empty head]]!"
* All versions of ''Series/FamilyFeud'' allow a family three misses on the board before forfeiting control of it to the competing family.
* One segment of ''SMTV Live'', ''Dec Says'', had "flashbacks" to Dec's childhood. Ant occasionally appeared in these sketches as an overweight schoolboy who ate huge amounts of food and was referred to as Gi-Ant. In each of those of appearances, the trope would come into play with his Homer Simpson-esque moments. For example:
-->''"Don't listen to [Dec], Mrs. Deeley; just ignore him. He's just jealous, 'cos he's a skinny beanpole. Aaaah, beans on toast. Even in his duffle coat, you can still see his ribs. Aaaah, barbecue and ribs. You see, he'd like to be like me: beefy. Aaaah, roast beef. *sighs*"''
* Happens on ''Series/FullerHouse''. In the season one finale, [[spoiler: Kimmy runs away from her wedding three times]] before she makes a choice to stay engaged.
* ''Series/TheWalkingDead'' '''Season 7 Ep. 1 SPOILERS''': [[http://www.vanityfair.com/hollywood/2016/10/walking-dead-season-7-abraham-dies-sasha-peace-sign Three peace signs]].
* Every edition of ''Series/MatchGame'' has this in some fashion. The original series (1962-69) used two teams each of three players, and the end game posited three questions posed to an earlier audience. Every version since then had the top three answers to a fill-in-the-blank in the audience match segment of the Super Match.

* [[MemeticMutation PROTIP:]] A trio of characters from different games is a standard ''GamePro'' cover.

* Music/BlueManGroup has kept itself to exactly three performers because it's the smallest group possible where you can have someone excluded from a majority somehow, a recurring factor used for a lot of their humor. (The Blue Men really only have individual personalities insofar as each one winds up doing several things -- the more oddball the better -- that cause the other two to look askance at him.)
* Music groups named after three people or things: Music/EarthWindAndFire; Music/EmersonLakeAndPalmer; [[Music/CrosbyStillsNashAndYoung Crosby, Stills and Nash]]; Music/PeterPaulAndMary.
* The band The Early November (other bands have probably done this as well, but this is the only one I'm aware of) came out with a triple CD release, the collective name being The Mother, the Mechanic, and the Path.
* Once upon a time, 3/4 time in music was considered the "perfect" time signature, and 4/4 was "imperfect." They were thus indicated with a circle (a ''perfect circle'') and an incomplete circle, respectively. The former has passed into obscurity, but the latter has morphed into the lower-case C we know today. Averted nowadays; very few popular songs are ever in 3/4 time, and the "C" is commonly believed to stand for "common time." Except for a song to be considered a true waltz it must be in 3/4 time ("And this song of mine / in 3/4 time" -- Christmas Waltz) Thus, [[VideoGame/TeamFortress2 Rocket Jump]] [[http://www.youtube.com/watch?v=eDNuX8iR1xk Waltz]] is not a waltz, but ''VideoGame/YoshisIsland'' [[http://www.youtube.com/watch?v=RZnu5xRa-Z4 Fortress]] is.
* Three chords is the stereotypical minimum for uninspired, bland pop/rock. Or, it could be intentional, "ThreeChordsAndTheTruth." Either way, you'll rarely see music with less, but plenty with just three. Subverted by Creator/SpikeMilligan with [[Radio/TheGoonShow "The Ying Tong Song"]]; Milligan wrote it because a friend bet him that he couldn't get a song with only ''two'' chords into the chart.
* Canadian musician Music/JoelPlaskett has a triple album called, fittingly, ''Three''. It even has a lyric stating "good things come in three." Each disk has 9 tracks, for a total of 27. He also released an EP called "Three More", which contained...3 tracks. AND most of the songs are in 3/4 time and contain lyrics and titles like "Rollin' Rollin' Rollin'", "Shine On, Shine On, Shine ON", etc.
* "Knock Three Times" by Tony Orlando and Dawn.
* Not really the {{Trope Namer|s}}, but "Rule Of Three" by the Lemonheads.
* Music/{{Weezer}} has three self-titled albums, called Blue, Green, and Red [[FanNickname by fans]].
* The ending of the ''2112 Suite'' by Rush (even Rush itself is an example (Geddy Lee, Alex Lifeson, Neil Peart):
-->[[spoiler:Attention all planets of the Solar Federation.\\
Attention all planets of the Solar Federation.\\
Attention all planets of the Solar Federation.\\
We have assumed control.\\
We have assumed control.\\
We have assumed control.]]
* Music/EmersonLakeAndPalmer had an album called ''Trilogy'', though in a slight subversion it was their ''fourth'' album. However, it can be considered to have been their third if one ignores their ''Pictures at a Exhibition'' album, as many fans indeed do.
* In "Coward of the County" performed by Kenny Rogers, Kenny tells the story of Tommy, a man who believes in TurnTheOtherCheek. Tommy has a loved one named Becky. One day the Gatlin Boys come a callin' and subsequently take turns at Becky. Kenny makes it a point to tell you there was three of them.
* The song "Threes" by Creator/MercedesLackey and LeslieFish is built on this trope.
* As is the song "Three" by Music/MassiveAttack.
--> ''Three's my lucky number''
--> ''And fortune comes in threes''
* "Sometime Around Midnight" by The Airborne Toxic Event ends with a Rule of ''Five''. This functions as a bit of BreakingTheFourthWall; the listener is ''expecting'' this trope to be in effect, and the fourth repetition surprises them, possibly even making them a little uncomfortable. In fact, they might think they misheard, until the fifth repetition underlines it. It might even be somewhat discomfiting. Which makes sense, as the singer is certainly disturbed.
--> ''You just have to see her''
--> ''You just have to see her''
--> ''You just have to see her''
--> ''[[SubvertedTrope You just have to see her]]''
--> ''You just have to see her''
--> ''You know that she'll break you in two''
* ''Party In The USA'' by Music/MileyCyrus:
--> ''That's when the taxi man turned on the radio''
--> ''And a Jay-Z song was on''
--> ''And the Jay-Z song was on''
--> ''And the Jay-Z song was on''
* [[http://www.youtube.com/watch?v=wtiQ3X6-Q2w&feature=related Scherzo]] [[http://www.youtube.com/watch?v=hPKzQhvI3_U&feature=related Tarantella]] -- It's ALL in triplet patterns.
* Indian Classical music (both Carnatic and Hindustani) has a huge array of compositions in meters with 3 counts per beat, which are often light and lilting numbers, though some are also heavy numbers. In rhythmic finales, it is customary to repeat the ending sequences three times, with optional variations.
* Several great concertos have ''three movements''. Music/JohannSebastianBach wrote six (2x3) Brandenburg Concerti. They are usually issued (whether as two separate [=CDs=] or as a double CD) with nos. 1-3 on one disc and nos. 4-6 on the other. The Third (perhaps due at least partly to the influence of Music/WendyCarlos' album ''Music/SwitchedOnBach'') is often considered to be one of Bach's greatest hits.
* The tone poem "The Golden Spinning Wheel" by Music/AntoninDvorak has a slow section that repeats the same music three times with subtle differences in phrasing and harmonic shifts. Naturally, it's based on a fairy tale.
* Music/DeLaSoul's album ''Music/ThreeFeetHighAndRising'' (in itself an example) has a song called "The Magic Number", which riffs on 3.
* Third use twist in Music/RoyZimmerman's satire number "Socialist!", a TakeThat to the louder, dumber chunk of the American political right:
-->(in a bad vaguely-Southern accent) "You drive here on a public street? ''Socialist.'' You go to a public school? ''Socialist.'' You ever been in a public library? ...[[BookDumb Why?]]"
* ''Music/{{Animals}}'' by Music/PinkFloyd has a song titled "Pigs (Three Different Ones)"
* "Three Little Birds" by Music/BobMarley from his album ''Music/{{Exodus|Album}}'', who were a metaphor for his backing trio the I-Threes.
* Three images of soldiers are seen on the cover of ''Music/{{Paranoid}}'' by Music/BlackSabbath.
* Done subtly in Music/IronAndWine's "The Trapeze Swinger", where the eponymous trapeze artist is mentioned exactly three times, though in a different context each time. The first time, the narrator recalls the happiest moment of his childhood, when he was dazzled by an acrobat at the circus. The second time, when the narrator goes through a painful breakup with his lover in a carnival parking lot, she refers to their turbulent relationship as a "trapeze act". Then in the last lines, where we learn that the narrator is actually [[DeadAllAlong dead]], and narrating the song while trying to climb his way up from Purgatory, [[ItMakesSenseInContext he vows to paint a mural of his life on the Pearly Gates]]--depicting himself as a [[TitleDrop "frightened trapeze swinger"]].
* "Number Three" by Music/TheyMightBeGiants is the third song on their debut, self-titled album (and allegedly the third song they ever learned to play), uses three vocal tracks, and contains all three of the possible three-line rhyme schemes (ABB, AAB, ABA) across its three verses.
* The refrain of "The Song of the Volga Boatmen" (commonly heard in contemporary culture in scenes involving menial labor) is Ещё разик, ещё да раз! (Yeshcho razik, yeshcho da raz!), which translates as "Once more, once again, still once more!"
* Many songs, whether old folk songs, modern-day pop, numbers from theatrical musicals, and so on include a sort of "triple refrain" where the last line of a song is repeated three times when it reaches the end. Quite often this incorporates [[ThreeChordsAndTheTruth the Three Chords]] but even where it does not, there is usually an inversion of the typical RuleOfThree, where it is the second iteration that has a variation (quite often only one note), and the last is the same as the first to bring that sense of closure so yearned for and reassuring to the ear. The emotional effectiveness of this, as cliche as it has become, can't be denied.
* [[Music/TheWiggles "Oh no!" "Oh what?!" "Oh no!" "Oh what?!" "Oh no!" "Oh what?!"]]
* Three Hammers by Dragonforce

* In ''Theatre/AnimalCrackers'', after the song "Hooray for Captain Spaulding," Spaulding tries three times to give his welcoming address. The first two times, the chorus interrupts him with encores of "Hooray for Captain Spaulding." He interrupts his third attempt by singing it himself, then saying: "Well, somebody's got to do it."
* Erronius in ''Theatre/AFunnyThingHappenedOnTheWayToTheForum'' is told to walk seven times around the seven hills of Rome. The first two times he re-enters and walks sloooooowly across the stage as the rest of the cast watch silently. The third time he gets run over during a chase scene.
* From ''Theatre/{{Rent}}'': "Say something. Anything." "Test, one, two, three-- " "Anything but that."
* One of the musical themes in ''Theatre/TheMagicFlute'', labeled "The Triple Chord," is three voicings of a B-flat major chord, each one repeated three times in a short-long-long pattern.
* In ''Theatre/TheMikado'', Pooh-Bah gives a "toast with three times three" repeating the phrase "long life to you" three times. Most people who play the role ham the third time up even more than is called for in the script (which is quite a bit.)
** Also from ''The Mikado'':
--->"One little maid is a bride, Yum-Yum,\\
Two little maids in attendance come,\\
Three little maids is the total sum,\\
Three little maids from school."
** From ''The Sorcerer'', the title character's counting scene.
* In ''Theatre/SweeneyToddTheDemonBarberOfFleetStreet'', Todd teaches Mrs. Lovett a pound-three-times signal.
* In ''Theatre/IntoTheWoods'', the Witch tells the Baker and his wife that they must bring her the items "before the chime of midnight in three days time" in order to break the spell.
* In the Creator/CirqueDuSoleil show ''Theatre/TheBeatlesLOVE'' a white VW bug appears several times. The third (or possibly [[FourIsDeath fourth]]) and final time [[spoiler: it smashes into a woman (who represents John Lennon's mother, who died in a car crash); the car bursts apart]].
* In ''Theatre/TheMusicMan'', the piano lesson scene begins with Amaryllis practicing the same passage three times, always ending on the same wrong note. Mrs. Paroo plays the right note for Amaryllis the first two times, and Marian enters to correct her third try.
* Skynyrd's "Gimme Three Steps"
* ''Theatre/PokemonLive'' has three trainers and three Pokemon [=MechaMew2=] defeats, and three girls Brock is interested in.

[[folder:Myth, Legend and Religion]]
* Shows up all the time in religion:
** Christianity does this so much that 333 is used by people being ostentatiously Christian:
*** Literature/TheBible: Three days pass between Jesus dying and returning to Earth. In fact, whenever a number is mentioned in the Bible, it's usually 3, 7, 12, or 40.
*** "Jesus answered (Peter), Wilt thou lay down thy life for my sake? Verily, verily, I say unto thee, The cock shall not crow, till thou hast denied me thrice". -- ''John'' 13:38. And then, after his resurrection, Jesus asks Peter three times if he loves him, extracting from Peter a promise to continue his work three times before he leaves him alone. This is often regarded as a symbolic reversal of Peter's thrice-denial of Jesus before his death. Also cf. the Fight Club example above.
*** The three Christian virtues: Faith, Hope, Love/Charity (Charity refers to ''agape'' or selfless love, as opposed to Eros as self-gratifying and/or sexual love).
*** Also, although the only reference to this event in the Gospels states that UsefulNotes/{{Jesus}} was placed "in a manger, because there was no room for them at the inn", Nativity plays tend to show two innkeepers telling Mary and Joseph to go elsewhere because all the rooms are taken -- before a third also says that there are no rooms, but that Mary and Joseph may use the stable, since Mary is pregnant.
*** The Gospel of Matthew, the only one that mentions the Wise Men or Magi, doesn't specifically state that there were three of them, only that they came "from the East". The gospel does mention that they presented Jesus with three symbolic gifts; gold (signifying Christ the King), frankincense (representing Jesus' divinity) and myrrh (an embalming incense, indicating that Jesus would die to save God's people).
*** When Jesus fasted in the desert, he was tempted three times by the Devil; 1) Turn the stones into bread, 2) Throw yourself from this cliff and let God save you, and 3) swear loyalty to me and the kingdoms of the world will be yours.
*** The Trinity: Father, Son and Holy Spirit. The first sometimes is represented by an eye set in a triangle. (Although there are also [[http://en.wikipedia.org/wiki/Nontrinitarianism nontrinitarian]] Christians).
*** The ''Kyrie'': Lord have mercy. Christ have mercy. Lord have mercy upon us.
** Examples from the Hebrew Bible or Old Testament:
*** The three sons of Adam and Eve: Cain, Abel, and Seth.
*** The three sons of Noah: Shem, Yaphet, and Ham.
*** The three patriarchs, also mentioned in the formula: The God of Abraham, Isaac, and Jacob.
*** The three kings of the united Israelite kingdom: Saul, David, and Solomon.
*** Jonah was in the belly of the fish for three days and three nights.
* UsefulNotes/{{Wicca}} has the "rule of 3" also known as the Three-fold law, meaning (depending on who you ask) that everything you send out into the world either returns to you thrice as strong in consequence, or comes back to you on the astral, mental and physical planes. Furthermore, when casting a Sacred Circle in Wicca, the typical procedure is to walk around the circle three times and say the incantation three times. (In some practices anyway.)
* This pops up occasionally in UsefulNotes/{{Judaism}}, though generally not as centrally as in Wicca:
** The world is sustained by worship, study and deeds of lovingkindness. Also known as love of Hashem, love of Torah, and love for your fellow human being.
** These temper judgment's severe decree: prayer, repentance and charity.
** In UsefulNotes/{{Kabbalah}}, the [[WorldTree Tree of Life]] has 3 pillars: The pillar of rigor, the pillar of mercy, the pillar of balance.
* Some religions divide reality into Heaven, Earth and Hell.
** For the Norse, the universe was divided into nine (thrice three) worlds on three levels: the upper level had Alfheim (elves), Asgard (war gods and those who died in battle), and Vanaheim (fertility gods). The middle level has Midgard (humans), Jotunheim (giants) and Svartalfheim (dark elves/dwarfes), The [[HailfirePeaks bottom level]] has Helheim (those who died of disease), Nifleheim (land of ice and fog) and Muspell (fire demons).
** There are a lot more examples in Norse mythology, mayby since as mentioned above thrice three is nine which is the holy ArcNumber of Norse Mythology:
*** The third generation of Gods created the world, those are three (Odin, Vili, and Ve).
*** Three gods created humans: Odin, Hönir, and Lodur (Loki).
*** There are three norns.
*** Yggdrasil has three roots.
*** Thor has three children: Thrud, Magni & Modi
*** Loki has three children with Angerboda: Hel, Fenrir & Jörmungandr.
*** The Fimbulwinter will last for three winters without summer in between.
*** The wolf Fenrir was bound by three fetters: Loeding, Drómi, and Gleipnir.
*** In the poem Völuspá, the description of Garmr's howl is repeated thrice.
*** Freyr anf Freyja has three magical items each.
*** Three of Odin's sons shall live after Ragnarök: Vidar [[spoiler: Baldur & Hödr]].
** UsefulNotes/{{Mormonism}} recognizes three heavens/kingdoms of glory after the Final Judgement: The Celestial Kingdom (itself divided into three kingdoms), the Terrestrial Kingdom, and the Telestial Kingdom.
* Subverted in [[Myth/NativeAmericanMythology Lakota mythology]]: Three is the number of imperfection, while four, far from its [[FourIsDeath other implications]], is the number of perfection.
* Hinduism : Three gunas (modes) of nature : goodness, passion, and ignorance.
** ''Literature/BhagavadGita'': Lust, Anger and Greed -- three gates to hell. Also gross, subtle and spiritual existence.
** Brahma, Vishnu and Shiva: The creator, the preserver and the destroyer.
* In one of the variants of the [[Myth/KingArthur Arthurian Legend]], Arthur has to ask whomever is present at the time (usually Bedivere) three times to return his sword to the Lady of the Lake.
* In Greek/Roman Mythology the rites of the three-formed witch goddess Hecate usually involve three. This can be seen especially in the practices of Medea, the wife of Jason of the Argonauts.

* [[Creator/MidwayGames Bally]]'s ''Pinball/DrDude'' requires the player to get the three Elements of Coolness (a Magnetic Personality, the Heart of Rock and Roll, and the Gift of Gab) three times before starting multiball.
* Two examples in ''Pinball/JunkYard'':
** "Save the Girl" requires you to hit Spike three times.
** Hitting the TimeMachine and pressing both flipper buttons three times when the clock shows 3:33 starts a [[EasterEgg secret mode]].
* One of the tasks in ''Pinball/ThePartyZone'' is to "Eat, Drink, & B. Merry".
* Many of the goals in ''Pinball/AmericasMostHaunted'' require hitting a target three times.
* In a more general sense, most pinball games made from the '70s onward default to three balls per game.

[[folder:Professional Wrestling]]
* ProfessionalWrestling is fond of this in some forms, ranging from the three way dance 'Triple Threat' match (3 fighters) to audience chants; one of the most popular is to match 3 syllables (e.g. 'R V D! R V D!' for Wrestling/RobVanDam). The other popular chant format? Four syllables and five claps ('You're a loser!' * * *** ), which adds up to nine.
* An infamous, horrifying 1981 match where Wrestling/ElSanto suffered a heart attack against Los Misioneros de la Muerte, cemented three on three, which was already being established as Lucha Libre Internacional's most popular match type, as the main match associated with Mexican Lucha Libre. If a promotion has a "trios", "tercias" or "six man" division, it's probably due to LLI. Even when they don't, the wild three on three matches of trios like Wrestling/TheShield can ultimately be traced back to it.
* Many a PowerStable, like Wrestling/{{n|ewWorldorder}}Wo, begin as and remained centered around a trio.
* Wrestling/RingOfHonor celebrated its third anniversary with three back to back shows.
* While there are many variations, it's common that a wrestling feud will consist of three matches. The wrestlers will trade wins in the first two matches, with the third as the blow off.

* The character of Errol in Creator/TheBBC series ''Series/FifteenStoreysHigh'' always answers a question truthfully, if asked it three times.

[[folder:Stand-Up Comedy]]
* RonWhite's recounting of the time he sued Sears for terrible service includes this line:
--> '''RonWhite''': "I execute a left-hand turn out of the parking lot, and my left rear wheel falls off. It falls off. [[ThisIsForEmphasisBitch It FALLS THE FUCK OFF]]! Turning my van into a tripod, and spinning me into a level of pissed off I've never felt before!"

[[folder:Tabletop Games]]
* Rather than using it as a trope, the ''TabletopGame/DungeonsAndDragons'' setting ''Planescape'' and its video game spinoff ''VideoGame/PlanescapeTorment'' explicitly mention the Rule Of Three in-story as a principle with cosmic validity. (''Everything'' involves the number 3 somehow. There are even three cosmic principles.) Since the world(s) of Planescape are [[ClapYourHandsIfYouBelieve shaped by belief]], it's not impossible that that's true. If enough people believe it's nonsense, it won't be...
** There are enough {{Flat Earth Atheist}}s like Morte to disbelieve it, yet the rule persists for the reason that Morte gives, that minds have a tendency to create patterns. This tendency is perhaps stronger than belief, which is why the rule can be widely debunked yet the evidence of it still appears.
** One NPC adopts this principle and runs with it clear off the field. Calling himself "Rule of Three," he's an information broker who requires things in sets of three as his payment, and gives three true answers to any question. As a second character is known to associate with another of the three cosmic principles, it's suspected a third is out there somewhere as well, because... well, Rule Of Three.
* In the Living TabletopGame/{{Greyhawk}} campaign, a magic item spoke three prophesies of destruction that the players could attempt to prevent.
* White Wolf's Storyteller/Storytelling systems use the Rule Of Three extensively:
** three sets of three attributes, usually physical (strength, dexterity, stamina), social (charisma, manipulation, appearance), and mental (intelligence, wits, perception), and three kinds of abilities (talents, skills and knowledge). The rest can vary depending of the individual games, but the Rule Of Three is also prominent in several:
** In the ''TabletopGame/NewWorldOfDarkness'' the three attribute groups are divided in another way, each with three traits in it like the main groups; power (strength, intelligence, and presence), finesse (dexterity, wits, manipulation), and resistance (stamina, resolve, composure).
*** The demo for ''TabletopGame/ChangelingTheLost'' has Blue Jenny, who [[spoiler: if her real name is spoken in her presence three times, her Keeper will be summoned. Hence the reason for her getting the motley's help retrieving what's actually her diary]].
*** In ''TabletopGame/MageTheAwakening'', mage tradition dictates that a mage owes three favours to any mage who acquires their soul stone (a piece of their soul distilled into physical form for power).
** In ''TabletopGame/OldWorldOfDarkness'':
*** In ''TabletopGame/VampireTheMasquerade'', each Clan has three favored Disciplines its members can learn more easily, and drinking the blood of one vampire three times, on three different nights, gives this vampire power over the drinker. Also, vampires have three virtues to fight their three different flavors of frenzy.
*** In ''TabletopGame/MageTheAscension'', the Resonance of a mage's magick is defined by three types of specific resonances: Dynamic, Entropic, and Static. This is linked to the cosmology of the Old World of Darkness (see below). Relatedly, they face three kinds of main foes: the Technocrats (linked to Stasis), the Nephandi (liked to Entropy) and the Marauders (linked to Dynamism).
*** In ''TabletopGame/ChangelingTheDreaming'', changelings can be of three general ages: childlings, wilders, and grumps. And since the setting is about mythos and fairytales, there are MANY occurrences of the Rule Of Three.
*** ''TabletopGame/WerewolfTheApocalypse'' introduced the cosmology detailed below, and also gives players three major traits that determine their werewolf character's place in the Garou Nation and what Gifts they can learn: tribe, auspice, and breed. Werewolves, and most other shapeshifters, have three breeds.
*** Over the course of the various editions of the various games, a somewhat unified and coherent cosmology emerged, with three major entities or forces: the destructive Wyrm, the creative Wyld, and the stabilizing Weaver, none of which are inherently evil (all in all, it's similar to the hinduist Trimurti). They play a major role in ''TabletopGame/WerewolfTheApocalypse'' (where they first appeared) and ''TabletopGame/MageTheAscension'' (the Tradition mages that players usually roleplay are, in a way, balancing the three against three kinds of extremists). Supplements that delved into the deeper aspects of the Triat (the common name used for the trinity of Wyrm, Weaver, and Wyld) would reveal that each of the three has three more specific aspects. The most well-known are the aspects of the Wyrm known as the [[NamesToRunAwayFromReallyFast Eater-of-Souls, the Beast-of-War, and the Defiler]].
** The ''TabletopGame/TrinityUniverse'' setting. Three games: [[TwoFistedTales Adventure!]], [[SuperHero Aberrant]], and [[AfterTheEnd Aeon]] (later renamed [[DisneyOwnsThisTrope Trinity]]). Three "classes" of character: paramorphs (or [[BadassNormal Daredevils]]), eximorphs (or [[SuperHero Stalwarts]]) and psychomorphs (or [[PsychicPowers Mesmerists]]). The actual mechanics show the same divisions as other Storyteller systems. Each stat doesn't have three skills though. But oh well.
** ''TabletopGame/{{Exalted}}'', while using almost the same system as the ''Old World of Darkness'', subverts expectations by running its setting on the number five instead. Indeed, that the Lunar Exalted use the Rule Of Three anyway makes them stick out incongruously, though that is justified: they ''used'' to have five castes and so forth, but their long exposure to the Wyld ([[PrimordialChaos unshapable chaos]] [[RealityIsOutToLunch outside Creation]]) has thrown them out of whack.
* ''TabletopGame/MagicTheGathering'' blocks are released in three sets. Furthermore, Wizards of the Coast have their own "rule of three" -- the first set establishes core concepts and mechanics, the second set develops them further, and the third introduces some new twist. For example, the third set of the artifact-based block ''Mirrodin'' presented effects that produced or used all five colors of mana, the third set of the legendary-based block ''Kamigawa'' gave the Epic spells and rewarded large hand sizes, and the third set of the land-based block ''Zendikar'' introduced the massive and colorless Eldrazi.
** The "One for Three" cycle of cards from the first core sets that cost one mana of it's color's mana type. Grating the caster 3 of something related to the color (Damage, Life, or most famously, card draw).
** The "charm" cycle. One card does one of three things.
** Effects are often printed in three-card "vertical cycles": a common card with a weak version of an effect, an uncommon card with a stronger version and a rare card with the strongest version. For example, the Apocalypse expansion included [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=26806 Bloodfire Dwarf]] at common, [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=28806 Bloodfire Kavu]] at uncommon and [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=28807 Bloodfire Colossus]] at rare.
* ''TabletopGame/DungeonsAndDragons'' for special defences: Fortitude, Reflex, Will.
** The physical stats: Strength, Dexterity, Constitution. The mental stats: Intelligence, Wisdom, Charisma.
** The alignments: Lawful, Neutral, Chaotic, and Good, Neutral, Evil. Put together into the alignment spectrum and there are nine options.
* ''TabletopGame/DogsInTheVineyard'' is geared for groups of about three [=PCs=], and Three In Authority is one of the most powerful rituals against demons (a two-PC group can pull it off with help from the NPC town elder).
* ''TabletopGame/InNomine'' has the three Realms, Corporeal, Ethereal and Celestial, which each have a type of Force associated with them, also there are three main types of supernatural beings, angels, demons, and ethereals.
* In Dungeon, a boardgame published by TSR and developed by, among others, Gary Gygax, to open a door, you have to roll for it three times. After the third time, you can just go through.
* Invoked in ''TabletopGame/UnknownArmies''. Threes tend to come up a lot in its PostModernMagic, especially in ritual magic. [[ArcNumber 333]] in particular has great mystical significance [[spoiler: because it's the number of seats in the Invisible Clergy, the ascended mortals/gods that personify humanity]].
* ''TabletopGame/{{Shadowrun}}'' 3rd Edition supplement ''Magic in the Shadows''. If a free spirit's [[IKnowYourTrueName true name]] is spoken three times in succession, the spirit [[SpeakOfTheDevil has to appear before the speaker]].
* The game TabletopGame/TheDarkEye -- especially in its ''third''(!) edition (it's now into its fifth) was fond of using the (more or less completely alliterative) triad for titles. Most famous examples probably are ''Tempel, Türme und Tavernen'' (temples, towers and taverns) and ''Kirchen, Kulte, Ordenskrieger'' (churches, cults, templars). Over time, it grated on the editors' nerves, and they promised to stop using them for the fourth edition. They maintained it for a while but ultimately succumbed to temptation, though, as titles such as ''Söldner, Skalden, Steppenelfen'' (soldiers, skalds, prairie elves), ''Granden, Gaukler und Gelehrte'' (nobles, buskers and scholars) or ''Krieger, Krämer und Kultisten'' (warriors, merchants and cultists) prove.

* ''Theatre/CyranoDeBergerac'': This trope is combined with DepartmentOfRedundancyDepartment: The gratuitous repetition of a question or a gesture three or more times are shown in the play:
** PlayedForLaughs: At Act I Montfleury tries to say his lines four times, Cyrano orders him to disappear when Cyrano claps his hands the third time, the bore asks Cyrano three times if he has a protector. Lampshaded by Cyrano when he does not answer a third time:
--> '''Cyrano''' ''(irritated):'' No, I have told you twice! Must I repeat?
** PlayedForDrama: At Act II, Cyrano asks Roxane three times what she would do if Christian is not as eloquent as he is fair; she answers two times that being fair, he has to be eloquent, and the third time she invokes DrivenToSuicide. At Act IV, Cyrano asks Roxane if she would love Christian, even if he would be ugly, three times. She answers yes every time.
* [[Creator/WilliamShakespeare Shakespearean]] examples:
** In ''Theatre/JuliusCaesar'', Marc Anthony speaks at Caesar's funeral:
-->You all did see that on the Lupercal\\
I thrice presented him a kingly crown,\\
Which he did thrice refuse: was this ambition?
** During this speech, he also says "Brutus is an honorable man" three times. A fourth time he just says, "And sure he is an honorable man", by which time he's in full SarcasmMode.
** Theatre/KingLear has three daughters to whom he intends to leave a third of his kingdom each. (However, he gets annoyed with the third one and ends up giving his kingdom to the other two).
** When [[spoiler:Mercutio]] is fatally stabbed in ''Theatre/RomeoAndJuliet'', he curses the Montagues and Capulets thrice ("A plague on both your houses!") before dying, thus ensuring that the curse comes true.
** ''Theatre/TheMerchantOfVenice'' has three caskets, of which the third chosen is successful.
** ''Theatre/{{Macbeth}}'' alone contains too many examples to count, most coming from the three witches.
** [[Literature/{{Discworld}} And therefore]] also the amount Witches like to assemble in, 'cause two is just an argument.

[[folder:Video Games]]
* ''Franchise/TheLegendOfZelda'':
** There's the supreme Triforce: Power, Wisdom, Courage. Also the three Goddesses that go with it: Din, Nayru, and Farore.
** [[VideoGame/TheLegendOfZeldaCDiGames Three CDi games]].
** Ever since ''VideoGame/TheLegendOfZeldaALinkToThePast'', there is almost always a twist that comes after three dungeons/{{MacGuffin}}s: Three Pendants of Virtue (in ''A Link to the Past'' itself and ''[[VideoGame/TheLegendOfZeldaALinkBetweenWorlds A Link Between Worlds]]''), three Spiritual Stones (in ''[[VideoGame/TheLegendOfZeldaOcarinaOfTime Ocarina of Time]]''), three Goddess Pearls (in ''[[VideoGame/TheLegendOfZeldaTheWindWaker the Wind Waker]]''), three Fused Shadows and then three missing Mirror Shards (in ''[[VideoGame/TheLegendOfZeldaTwilightPrincess Twilight Princess]]'', note that [[FreeSamplePlotCoupon the fourth Fused Shadow is already in Midna's possession and the fourth Mirror Shard is still in its place]]), three Servant Spirits and then three Pure Metals (in ''[[VideoGame/TheLegendOfZeldaPhantomHourglass Phantom Hourglass]]''), and three Ancient Tablets, three Sacred Flames, three Dragons who know the Song of the Hero and the aforementioned three fragments of the Triforce (all of them in ''[[VideoGame/TheLegendOfZeldaSkywardSword Skyward Sword]]''). To a lesser extent, ''A Link to the Past'' also started the tradition of certain abilities, items and tools coming in sets of three (Magic Medallions, Spells, elemental Arrows, etc).
** In ''VideoGame/TheLegendOfZeldaMajorasMask'', Link has three days to save Termina. Each temple also has three boss fights: A MiniBoss to obtain the Hero's Bow or elemental arrow (of which there are three), another to obtain the Boss Key, and a main boss to free the giant and end whatever curse has invaded the land. And the final boss is fought in three stages.
** The ''VideoGame/TheLegendOfZeldaOracleGames'' were supposed to be three (the third game would have featured Farore), but the link system between three games was too complicated to implement.
** In ''VideoGame/TheLegendOfZeldaTheMinishCap'', there are three [[ForDoomTheBellTolls bells tolls]] in the final dungeon [[spoiler: and after the third, Vaati becomes a god and Zelda is permanently turned to stone]].
** Several bosses will go down after three sets of attacks from Link. [[VideoGame/TheLegendOfZeldaOcarinaOfTime King Dodongo]], for instance, goes down after three bombs.
** Link begins every game with 3 hearts.[[note]]Except for ''VideoGame/TheLegendOfZeldaSkywardSword'', where he starts with six; and ''VideoGame/ZeldaIITheAdventureOfLink'', where his rectangle-based meter starts with four.[[/note]]
* ''Franchise/SuperMarioBros'':
** Almost all bosses in non-RPG Mario games contain some relevance to three, be it the amount of hits it takes, or the phases it goes through, or a combination thereof.
** There are also three parts to the [[VideoGame/MarioAndLuigiBowsersInsideStory Miracle Toadley Cure]].
** In ''VideoGame/SuperPaperMario'', World 7 contains many mythological references, many of which invoke the Rule of Three.
** Each world in ''VideoGame/SuperMarioBros2'' has three levels, except the last world (which only has two).
** ''VideoGame/SuperMarioBros3'' has threes hidden in various maps. One is three threes of coins in World 5-1. Also, the king of World 3 lives in Kyoto (where Nintendo's headquarters are).
** Mario in ''VideoGame/SuperMarioGalaxy'' can take three hits before he dies. The only exceptions are if he finds a Life Mushroom, which gives him three more hits as long as he gets coins to replenish any hits, or is doing the Daredevil Comet Challenge, which gives him ''one'' hit.
* The Three Trials in ''VideoGame/MonkeyIsland''.
* In ''VideoGame/TheCurseOfMonkeyIsland'', Guybrush is told by the Voodoo Lady that he needs three things [[spoiler: to get to Blood Island:]] A map, a ship, and a crew.
* ''VideoGame/DragonAgeOrigins'' has three dragons. The [[BigBad Archdemon]] is the final boss; [[VoluntaryShapeshifting Flemeth]] and the High Dragon are optional.
* ''VideoGame/DragonAgeInquisition'', the third game in the ''Franchise/DragonAge'' series, has threes plastered all over its design and writing. There are three advisers at the War Table, representing three aspects of the Inquisition's power (CombatDiplomacyStealth), and three Keeps to reinforce each of them. Each of the three character classes is represented by three companions and contains three specializations. The narration shows an implicit ThreeActStructure, with each act spanning three main quests. Three power players vie for dominance in the Winter Palace, and three candidates compete for the Sunburst Throne in the endgame. Lastly, three major DLC expansions have been released: a sandbox, a dungeon crawl, and a story epilogue--mirroring all three of the contemporary WesternRPG subgenres.
* ''VideoGame/{{Ori and the Blind Forest}}'' has the protagonist Ori searching for and restoring the three Elements that sustain the dying forest of Nibel, the Elements of Water, Wind, and Warmth.
* ''VideoGame/{{Ultima}}'':
** The Virtues were organized in overlapping threes; three Virtues are based directly on one of three Principles, three were based on a combination of two Principles to form another trinity, and one Virtue is based on all three Principles. One Virtue stood as a Unity of the three groups of three.
** The games themselves are organized into three trilogies. The first three are the Age of Darkness, when most of the land is filled with monsters and dominated by the evil Triad. The second three are the Age of Enlightenment, as Lord British cultivates civilization and an ethical foundation based on the Virtues; in this arc the Codex of Infinite Wisdom is first brought from the Void, and then returned to share with another civilization. The final trilogy, involving the Avatar's nemesis the Guardian, is actually spread over five chapters, including ''[[VideoGame/UltimaVIIPartII VII Part 2]]'' and VideoGame/UltimaUnderworld II.
* In the ''Franchise/RatchetAndClank'' 'series:
** The first game, ''VideoGame/RatchetAndClank'':
*** Most of the planets have three paths, or two paths and a special area (gravity boots, hoverboard race, etc.)
*** The final boss fight has three phases.
** ''VideoGame/RatchetAndClankGoingCommando''
*** The Thug Leader of Thugs-4-Less must be defeated three times.
*** The final boss fight at the end of the game has three phases, but can be shorter if the player applies MoreDakka.
** Dr. Nefarious at the end of ''VideoGame/RatchetAndClankUpYourArsenal''.
* ''VideoGame/PlanescapeTorment'', as explained above under TabletopRPG.
* ''VideoGame/SamAndMaxFreelancePolice'':
** The game series is split into three seasons.
** Max correctly guesses the number of prophecies the Sea Chimps have thanks to the series' use of this trope, with heavy LampshadeHanging.
** Episode 103 is where the duo is initially given 2 tasks to complete for the Toy Mafia. Immediately after Chuckles says "two things you must do for us." another mafia member alerts him of a new problem that has arisen, causing Chuckles to correct himself and gives the heroes three tasks.
* ''Franchise/{{Pokemon}}'' has this in spades.
** Generation I has Articuno, Zapdos, and Moltres. The second generation has Raikou, Entei, and Suicune. Generation III has Regirock, Regice, and Registeel, as well as Kyogre, Groudon, and Rayquaza. Generation IV has Dialga, Palkia, and Giratina as a trio, as well as Azelf, Uxie, and Mesprit. The fifth generation has ''three'' trios: The Tao, Kami and Musketeer trios.
** The maximum number of evolutionary stages for a single Pokémon is three (unless it branches, such as Eevee, who started out with three evolved forms; it now has eight). Apart from Eevee, the only other Pokémon who has more than two branches in its evolution, Tyrogue, has three evolved forms.
** By the end of each generation, there are three non-remake games: [[VideoGame/PokemonRedAndBlue Red, Blue, and Yellow]] in Generation I (in Japan, Yellow is the TrilogyCreep, because there's already Red, Green and Blue); [[VideoGame/PokemonGoldAndSilver Gold, Silver, and Crystal]] in Generation II; [[VideoGame/PokemonRubyAndSapphire Ruby, Sapphire, and Emerald]] in Generation III; and [[VideoGame/PokemonDiamondAndPearl Diamond, Pearl, and Platinum]] in Generation IV. Though with Generation V, they've finally broken this chain by creating [[VideoGame/PokemonBlack2AndWhite2 Black 2 and White 2]].
** There's also three starters in all games except for ''Yellow''.
* ''VideoGame/CommanderKeen'' started as a trilogy, had another three episodes (a duology and a stand-alone adventure), and was going to have another trilogy before it got cancelled.
* ''VideoGame/GranblueFantasy'' applies this to the playable version of Cerberus. True to her namesake, all of her skills work in threes, often referencing threes in name at the same time. Absorption hits three times and heals Cerberus for up to 1333 HP. Disillusion hits three times. Triad Deception inflicts three debuffs on the enemy. Lastly, her triple attack rate is increased by her support skill; Infernal Heaven, and her charge attack; Triple Damnation.
* ''VideoGame/Wolfenstein3D'', ''Videogame/{{Doom}}'' and ''VideoGame/{{Heretic}}'' each started out with three episodes. The latter two each have episodes consisting of nine (three squared) missions (counting the optional secret levels; ''[=Wolf3D=]'''s have nine when ''not'' counting those).
* In ''VideoGame/QuakeIIIArena'' the Quad damage powerup, contrary to what the name would suggest, multiplies your damage by three.
* In ''VideoGame/{{Scribblenauts}}'', if you feed an animal something three times, it goes to sleep.
* In ''VideoGame/{{Nintendogs}}'', you must say the name of a trick clearly 3 times for your dog to learn it.
* Some of the earlier games for the UsefulNotes/SegaMasterSystem (such as "Safari Hunt", "Ghost House" or "My Hero") only had three levels each. The "fourth" level was usually the repeat of the first, but with stronger or faster enemies, the "fifth" level was the repeat of the second level, and so on, with the difficulty upped every time the three levels were completed.
* ''VideoGame/SonicTheHedgehog1'' and ''VideoGame/SonicTheHedgehogCD'' had three acts per zone, and so did the five Sonic games released on the Game Gear. In later games, there are usually teams of three, shown in ''VideoGame/SonicAdventure2'' with the Heroes (Sonic, Knuckles, and Tails) versus the Dark (Shadow, Rouge and Eggman). Further built upon with ''VideoGame/SonicHeroes'', where each team is a team of three: Team Sonic, Team Rose, Team Chaotix, and Team Dark (which is Shadow and Rogue again, but with E-123 Omega). Also another example is that Metal Sonic has three forms, his normal "hedgehog" form, then his Metal Madness (a gigantic metal dragon-ish form) and his final form, Metal Overlord.
* The ''VideoGame/MetroidPrimeTrilogy'' games frequently invoke the rule of three, with three Temples in ''[[VideoGame/MetroidPrime2Echoes Echoes]]'' (and each of them requiring 3 Keys for full access), 3 Phazon-infested planets in ''[[VideoGame/MetroidPrime3Corruption Corruption]]'', and the 3 alternate beams and 3 alternate visors in each game. Also, in the second game, Dark Samus is fought a total of three times. In ''[[VideoGame/MetroidPrimeHunters Hunters]]'', each of the eight portals leading to the Octoliths has to be activated by retrieving three Alimbic Artifacts.
* ''VideoGame/SwordOfTheStars'' has three classes of FTL-capable starships, with each being thrice the length of the previous.
* ''VideoGame/JurassicParkTrespasser'' has three different tribes of raptors. Also, the neurotoxin dart rifle in one level holds exactly three shots, which, if you take it all the way to the end of the level with you, is exactly how many shots to the head it needs to kill the T-Rex waiting for you.
* In the ''Franchise/AceAttorney'' series, a trial in the courthouse for a particular case can only last up to a maximum of 3 times before the judge passes the final verdict to the accused. In the third game, ''Trials and Tribulations'', the character Dahlia Hawthorne appeared exactly 3 times in the courthouse for 3 different cases as a witness before she is "permanently retired" for good. The main protagonist also faced Godot in a courthouse battle up to 3 cases in total. The series was originally a trilogy, before the focus shifted briefly to Apollo Justice before settling back on Phoenix.
* ''VideoGame/HeavyWeapon'' gives you three lives per level, allows you to have a maximum of three [[SmartBomb Nukes]] and three levels of DeflectorShields, and you can upgrade your equipment to a maximum of three levels.
* ''Videogame/{{Portal 2}}'':
** The game combines this with DepartmentOfRedundancyDepartment:
--> '''[=GLaDOS=]''': Well, this is the part where he kills us.
--> '''[[spoiler:Wheatley]]''': 'Ello! This is the part where I kill you!
--> Chapter title shown: The Part Where He Kills You.
** There's also the achievement, but it doesn't appear on subsequent playthroughs, making it three.
* ''VideoGame/{{Shatterhand}}'' requires three alpha/beta powerups to activate the robot companions.
* ''Franchise/TheElderScrolls'':
** ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]'':
*** Sets of three exist in numerous places within the game, all following the FighterMageThief breakdown. There are three vampire clans in Vvardenfell (the Quarra as the physical-focusing, the Aundae as the magic-focusing and the Berne as the stealth-focusing), three Imperial Guilds (the Fighters', the Mages' and the Thieves') and three Great Houses with a significant presence in Vvardenfell (Redoran as the warriors, Telvanni as the sorcerers, Hlaalu as the sneaky merchants). And then there is the fact that the local religion centers around three gods (with a corresponding set of three 'Good Daedra'), who outright are referred to as "The Three" in some dialogues... suffice to say that three recurs a lot in ''Morrowind''.
*** In the ''Bloodmoon'' expansion, you have to kill spriggans three times before they stay dead.
** In ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'' every dragon shout is comprised of three words of power. Ditto for the names of dragons.
* ''VideoGame/JetForceGemini'': Three playable characters, each of them visits three planets and, in the third of them, they face a boss. They then go to Mizar's Palace for a first-time confrontation against the BigBad. Then they have to find twelve ship parts, of which three are hatch keys (one for each of them).
* In ''VideoGame/BlackAndWhite'', the Sailors' Quest involves the aforementioned sailors asking for three things by song: Wood, grain, and meat.
* ''Franchise/FinalFantasy''
** Some games like (''[[VideoGame/FinalFantasyVII VII]]'', ''[[VideoGame/FinalFantasyVIII VIII]]'' and ''[[VideoGame/FinalFantasyX2 X2]]'') give you three people per party. ''VideoGame/FinalFantasyIX'' gives three early bosses called The Black Waltz, essentially three powerful Black Mages. After the third Waltz is defeated, Zidane comments that the name "Waltz" indicates that there won't be any more of them.
** Notably, every game since ''[[VideoGame/FinalFantasyIV IV]]'' has had exactly three female characters in the playable cast, regardless of the total cast size. This is explicitly referred to as the 'Three Females Rule' in Squaresoft fan circles. Note that later games have gravitated toward a total playable cast size of 6, thus equalizing the gender balance while still following the rule. Usually, one female is [[SugarAndIcePersonality broody and aloof]], the other is [[GenkiGirl young and energetic]], and the third is usually somewhere in between.
* ''Franchise/KingdomHearts'' generally gives you a three-person party of Sora, Donald and Goofy (Donald and Goofy can be replaced by other playable characters). And in the ''Disney/OneHundredAndOneDalmatians'' side-quest in the first ''Kingdom Hearts'' game, 99 Dalmatian puppies are found throughout the game hidden in chests. There are always three puppies in each chest, for a total of 33 chests.
* ''VideoGame/WorldOfWarcraft'':
** Three talent trees/specializations (Mists of Pandaria bucked the trend and gives Druids four specializations).
** Three roles: Tank, Healer, Damage
** Three kinds of pets: Cunning, Tenacity, Ferocity
** Many, many 5-player instances feature three boss fights. And if their entrances don't have a singular quest giver (who usually comes with two bodyguards), it's usually a group of three.
** Even in questing, more often than not when you come to a new town or area, if you pick up all the quests and go out to do them all before you turn them in, you may end up doing that 3 times before someone sends you to a new town or area. And often one quest giver will give you three different tasks one after another and the third one is usually the most important.
* ''VideoGame/BlazBlue'': Each character's story branches (except the true branch) have [[MultipleEndings three endings]]: True ending, Alternate Ending, and a Gag Reel. Also, there's three main characters (Ragna, Jin, and Noel)
* Many DrivingGames, particularly those from or styled after the ''VideoGame/MarioKart'' series, use three laps as the standard duration of a race, occasionally wavering only if the track is very long or very short. The online driving game ''[[Disney/WreckItRalph Sugar Rush Speedway]]'' has three types of course; it has three championship rounds, one for each course type, plus a final championship round featuring all three types in each course; each championship has three courses, and hence three races; the third and fourth have three-lap races; and initially, three racers are unlocked.
* ''VideoGame/MystIIIExile'' heavily uses this trope as much as ''VideoGame/{{Riven}}'' used Rule of Five. There are 3 Lesson Ages (excluding the final one), which internally hold 3 sections, puzzles, or environments, colors, symbols, and more.
* When a game has colour-coded doors which unlock with the matching key, there are nearly always three colours (usually red, yellow and blue).
* ''[[VideoGame/NexusWar Nexus Clash]]'' has three sides -- Good, Evil and Free Will. Each side is governed by three [[PowersThatBe Elder Powers]] that represent various facets of their alignment. There were once ''four'' Elder Powers for each side, but one of each was [[FourIsDeath killed/disappeared]] before the events of any of the games.
* In the ''VideoGame/{{Neptunia}}'' games, the oracle Histoire always requires three days to accomplish anything.
* The INCESSANT number of "match-3-or-more-in-a-row" Bejeweled-esque flash games.
* Survivors in ''Videogame/DeadByDaylight'' can be impaled on a meat hook only three times. The first time, they are able to try and struggle free. The second time, you only have half the bar to give you less time. Be snagged again, and it is instant death.
* ''{{VideoGame/Fairune}}'' has this in both games.. Three Red Gems to enter the Lava Zone, three Green Gems to return from the Lava Zone, three Logs to build a raft in the water ruins of the Underworld and Hope Girl needs to bring three Sacred Icons to the monolith on the Grasslands in Fairune 1. In Fairune 2, every door leading to the fairy requires three orbs of a color and three logs are again cut down and used, this time to complete a bridge across a river. [[spoiler:You'll also need three Dimensional Stones to access another part of Sky Land, and three different swords to open the last door before the final boss.]]
* ''VideoGame/FireEmblemTheSacredStones'' features the three famed generals of Grado, who lead the army that opposes the player's party for most of the game. We have the [[KnightInShiningArmor veteran knight]] Obsidian general [[OldSoldier Duessel]], [[MyCountryRightOrWrong loyal]] Fluospar general [[MagicKnight Selena]] and [[AntiVillain honorable]] Sunstone general [[DragonRider Glen]]. Just before the start of the series they are joined [[spoiler: and gradually replaced]] by three more generals, the [[AxCrazy sociopathic]] Moonstone [[BloodKnight Valter]], [[OnlyInItForTheMoney unscrupulous mercenary]] Tiger Eye [[TheStarscream Caellach]] and the [[SinisterMinister scheming bishop]] Blood Beryl [[ManipulativeBastard Riev]]. Having a total of six generals divides them into the [[AntiVillain noble original trio]] and [[CardCarryingVillain three shady newcomers]].
* Lampshaded in ''VideoGame/SpiderManEdgeOfTime'', when Amazing Spider-Man has to retrieve three time gate parts, each controlled by three consoles.
-->'''Spider-Man 2099:''' The part will be safe to take after all three consoles around it are deactivated.\\
'''Amazing Spider-Man:''' Why do these things always come in threes?\\
'''Spider-Man 2099:''' I have no idea.\\
'''Amazing Spider-Man:''' You know, that's going to bug me the rest of the day.
* In ''VideoGame/{{Undertale}}'':
** Mad Dummy: 'Foolish. Foolish! FOOLISH!' and similar.
** 'Come and buy pastries made by spiders, for spiders, [[BlackComedyCannibalism of spiders!]]
** Three traps from [[ActionGirl Undyne]] before final battle vith her.

[[folder:Web Comics]]
* ''Webcomic/StatisticalFact'' often combines the rule of threes with statistics to spotlight a humorous anomaly. See [[http://statisticalfact.com/sf/sedentary-stalker/ this comic]] for an example.
* ''Webcomic/TriquetraCats'' features three sisters taking up the mantle and war that their deceased mother was unable to finish.
* From ''Webcomic/AMiracleOfScience'': Benjamin mentions that he spends much of his rare days off listening to classical music; he gives Bach, Prokofiev, and ''Music/TheBeatles'' as examples. (The webcomic's artist expounds on the Rule in his [[http://project-apollo.net/mos/mos084.html commentary]].
* In ''Webcomic/EightBitTheater'' [[spoiler: Onrac is destroyed because of Sarda and Black Mage three times.]]
-->''Where lightning can't strike thrice!''
* ''Webcomic/MSPaintAdventures'' has this during the Problem Sleuth story. Three detectives, three dames, three gentlemen, three faces for DMK. Threes are everywhere in that story.
* The latter entries in ''Webcomic/BugMartini'' tend to have one panel of set-up, followed by three more panels, each with a mini joke within them. "[[http://www.bugcomic.com/comics/random-thoughts/ Random Thoughts]]" is a good example of this trope in action.
* ''Webcomic/BobAndGeorge'' [[http://www.bobandgeorge.com/archives/001105c With commentary explaining why two failures and a success make a good pattern.]] [[http://www.bobandgeorge.com/archives/001113c And again here.]] In fact, if you keep reading the commentaries, Dave comes back to this a lot, counting how many repetitions of a given gag he uses. Also, three strips in a row of thought bubbles when carrying out a plan hatched by [[DumbassHasAPoint Bass]], all of which ended in them questioning the wisdom of taking tactical advice from the resident [[TheDitz ditz]]. Summarized version:
--->'''Protoman''': I suppose they're right, I can't take Mynd on my own...when did we start listening to Bass?\\
'''Roll''': Shame I never got to that relationship storyline...wait, when did we start listening to Bass? We're all going to die.\\
'''Bass''': [pause] I like ice cream. [Pause] When did they start listening to ''me''?
* ''Webcomic/{{Derelict}}'' The main character ponders them, related to survival: three minutes without air, three days without water, three months without food. Then she wonders if she got it right.[[note]]Not exactly: three weeks without food is the rule.[[/note]]
* Referred to by name in ''Webcomic/ZebraGirl'', by Sam (being Dangerously Genre Savvy is his thing) as an explanation for why he smacked their new ally three times: once for trying to attack him, once for not immediately joining his side, and once for talking with his mouth full.
* In ''Webcomic/TalesOfTheQuestor'', [[http://www.rhjunior.com/totq/00532.html Quentyn asks for each boon three times, and the fae lord grants it -- the third time is when it kicks into effect.]]
* In ''Webcomic/RustyAndCo'', [[http://rustyandco.com/comic/level-6-42/ Madeline keeps cutting her head off, and the vampire puts it back on, getting seriously annoyed by the third.]]
* In ''{{Webcomic/Freefall}}'', [[http://freefall.purrsia.com/ff2300/fc02283.htm Clippy realizes that when all three plans have failed, they were foiled.]]
* In ''Webcomic/GirlGenius'', [[http://girlgeniuscomic.livejournal.com/74654.html the third time]] Zola needs to be rescued when Agatha wants to talk to Gil, Agatha rescues her.
** Also Jagers only get 3 tries to steal Old Man Death's hat.
** In the heart of Castle Heterodyne, there are three lights.
*** When Agatha first speaks to the Castle, [[http://www.girlgeniusonline.com/comic.php?date=20071012 the first light comes on.]]
*** When she proves her identity as a true Heterodyne, [[http://www.girlgeniusonline.com/comic.php?date=20080820 the second light comes on.]]
*** And when she restores power to the Castle (in yet another MomentOfAwesome) ... the '''[[http://www.girlgeniusonline.com/comic.php?date=20121224 THIRD LIGHT!]]'''
* There's a webcomic named ''[[http://www.drunkduck.com/Rule_Of_Three Rule Of Three]]'' which centers around three female friends.
* Played with in [[http://www.darthsanddroids.net/episodes/1043.html this]] ''Webcomic/DarthsAndDroids'', in which the GenreSavvy [=DM=] is confused when a player states a list with only two items.
* In ''Webcomic/StrongFemaleProtagonist'', [[GadgeteerGenius Paladin]] explains to Alison/Mega Girl [[AIIsACrapshoot the difficulty she had in creating a stable AI]]. On her first attempt, she tried to give it [[ForGreatJustice an innate sense of justice]]:
--> '''Alison''': How'd that turn out?
--> '''Paladin''': [[KnightTemplar Immediately tried to kill me]] and [[CrushKillDestroy destroy everything in the lab]].
--> '''Alison''': Oh no!
--> '''Paladin''': Mark II was programmed with [[AllLovingHero a sense of empathy, understanding, and compassion]].
--> '''Alison''': And?
--> '''Paladin''': [[TooGoodForThisSinfulEarth Immediately killed itself.]]
--> '''Alison''': Oof.
--> '''Paladin''': Then I tried [[FunPersonified humor]].
--> '''Alison''': And that worked?
--> '''Paladin''': No, [[SadClown it also killed itself]], but only because [[ExplosiveOverclocking I gave it a little too much processing power]].
* In the TrainingMontage of ''Webcomic/TowerOfGod'' there are scenes of Rak and Amigochaz throwing spears at high frequency. The first time Amigochaz proves that he is on the same level as Rak, the second time Parakewl just watches dumbfounded as he is left behind and the third time, in a thumbnail-sized addendum, you can see them still going at it at midnight.
* In ''Webcomic/TheOrderOfTheStick'', there is [[http://www.giantitp.com/comics/oots0844.html this]] CutawayGag, then [[http://www.giantitp.com/comics/oots0853.html this one]] several strips later, to the exact same place. The pattern is subverted in [[http://www.giantitp.com/comics/oots0855.html this]] third strip.
--> '''Roy:''' Huh. [[NoFourthWall I really felt like there was going to be a cutaway panel there.]]
* In ''Webcomic/TheAdventuresOfDrMcNinja'', while Mayor Chuck Goodrich is in hiding and pretending to be dead, the doctor points out he could use this time to read ''Literature/InfiniteJest'', play ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'', or "third thing that takes a long time".
--> '''Chuck:''' I do like third thing...

[[folder:Web Original]]
* The ''WebAnimation/YouTubePoop'' video ''[[http://www.youtube.com/watch?v=FgRUTAlu1-A Meet the Artillery]]'' by electricthecheese does this by having an overly-long-gag of [[VideoGame/TeamFortress2 Heavy Weapons Guy]] saying "GUN." After a while, there is a long, unedited period, and at the most unexpected moment, the Heavy makes a loud, virus-sounding noise and one of the Franchise/CareBears inexplicably pops in. Also, the Engineer introduces himself several times, and then the Heavy and Sniper introduce themselves as engineers as well.
* Used straight, then lampshaded in ''WebOriginal/LifeInAGame''. When Lollerskates assumes his [[ClippedWingAngel final form]] during his [[http://www.lifeinagame.com/pages/episode62.html Final Showdown]] with the heroes, all it takes is three shots to his [[AttackItsWeakPoint incredibly obvious weakpoint]] to finish him, which [[Franchise/{{HALO}} the Master Chief]] calls him out on after his defeat. Then he teabags him.
* A common joke in YouTubePoop videos involves repeating a line three times, with some sort of effect applied for the third time (an example as seen in [[https://youtu.be/OaVBWjEPpT0?t=542 this]] WesternAnimation/SofiaTheFirst [=YTP=]). It plays on the viewer's expectations by making them believe that the scene occurs a certain way and gives them time to become comfortable with it, before surprising them with a twist.
* ''Machinima/RedVsBlue'''s "Son of a bitch!" running gag is usually done in threes, occasionally twisted with Spanish-speaking robot Lopez's "Madre de dios," subtitled as "Son of a bitch!". Also, when Simmons and Grif are facing down the tank in Season 1:
--->'''Simmons:''' Alright, let's run on three.
--->'''Grif:''' Wait, ON three, or one-two-three-THEN go?
--->'''Simmons:''' ON three, it's always faster to go on three! Okay ready, one. . .
--->* Grif starts running*
--->'''Simmons:''' two. . . three! * turns around, sees Grif already far away* Oh, you backstabbing cockbite.
* In the [[http://www.19nocturneboulevard.net/ 19 Nocturne Boulevard]] episode ''Sword Kvetch'', Cael must face the evil wizard's three challenges. Why? Tradition!
* {{Lampshade|Hanging}}d in Episode 4 of [[Website/{{Cracked}} Cracked TV]] (5 Things You Shouldn't Be Able to Buy on eBay):
---> Tic-Tacs! Bag of Dice! Some...third thing!
* Played straight in Creator/HarryPartridge's ''Stephen the Lesbian''.
--> "[[MakesJustAsMuchSenseInContext All hail Stephen, king of the Lesbians]]!"\\
"All hail Stephen, king of the Lesbians!"\\
"All hail Creator/StephenKing! *{{Beat}}* Of the Lesbians!"\\
"[[FlatWhat What-?]]"
* Hewy in ''WebVideo/HewysAnimatedMovieReviews'' reviews ''WesternAnimation/ToyStory3'' for the third episode of his third season.
* In ''WebAnimation/ZeroPunctuation'', Yahtzee subverts this in his review of ''VideoGame/JustCause''. He uses the title as a joke the first two times, where on the third he simply comments "how should I know?"
* From the ''WebAnimation/YouTubePoop'' [[http://www.youtube.com/watch?v=CQn-z3eVgno Skellington's Revenge]]:
--> '''[[WesternAnimation/TheNightmareBeforeChristmas Sally]]''': ''(after Jack says her vision of Christmas disaster is splendid and asks her to make him some crack)'' No! You're being an ass!
--> '''Mayor''': ''(after Jack kicks him out for saying conquering Christmas is a bad idea)'' Ugh...You're being an ass!
--> '''Jack''': [[spoiler: ''(after realizing Main/{{Satan}} is just using him to take over Halloween)'' [[HeelRealization How could I be such an ass?]] ]]
* ''WebVideo/DragonballAbridged'':
** In Episode 18 this exchange took place three times when another character says something with potential sexual connotations to Gohan.
-->'''Gohan''': I need an adult...\\
'''Other character''': I ''am'' an adult.
** Their spoof of ''Broly'' had this line.
--->'''Vegeta''': First of all, I need more towels. ''Second'', I need more towels. Thirdly, [[{{Subversion}} I need more trowels]]. The masonry in here is horrible.
* In ''Literature/TheDoctorsOfTheCatFamily'' it's first explained how Lewis' brother and sister dealt with knowing they couldn't please their father (partly by having Lewis cheer them up), and then how Lewis dealt with it. Also, at the end Lewis and Thomas are noted for their big hearts and Meredith for her strange sense of priorities.
* In [[https://www.youtube.com/watch?v=EFQ1SWa9GQg CrapShots #168]], James pokes a clown three times. The first two times get the same reaction, while the third, while similar is unexpected.
* In ''Robotic Bartenders! (Cruise Day 1)'' by [[WebVideo/MatthewSantoro Matt Santoro]], Matt asks Nadine what they should cheer to. She says "a successful first day" and a "tomorrow of epic awesomeness". He says that they should cheer to exactly 1 more thing, so they cheer to living life.
* In "WHAT KILLS YOU MAKES YOU STRONGER - Respawn Man (Part 2/4)" by ''LetsPlay/SantoroGaming'', Matt plays the video game ''Respawn Man'', and only has to jump twice to complete a level, but jumps three times for good luck.
* ''WebVideo/BuzzfeedUnsolved'' discusses the usage of this trope in episodes centering around demons, since the RuleOfThree is allegedly significant in mocking the Holy Trinity. Ryan mentions when spending the night at the Sallie House, that at 3:00 am he's going to be quiet for 3 minutes to see if any demonic activity happens at that specific time. When they go to a demonic bridge, Ryan mentions that according to lore, if you knock on it three times, the demon that haunts it will throw you off. They try it: [[AntiClimax nothing happens]].
* ''Podcast/RandomAssault''follows a three-segment podcast.
* In [[http://randomhoohaas.flyingomelette.com/gw/otimusya/hokutonoken/ Otimusya - Hokuto no Ken]], phrases beginning with "Wow, Ken" appear 3 times in the article.
-->True to the Hokuto no Ken lore, Kenshiro has plenty of enigmatic ways of dispatching his foes.\\
[[http://randomhoohaas.flyingomelette.com/gw/otimusya/hokutonoken/hokutonoken9.gif A single high-kick sends the goons hurtling through the stratosphere.]]\\
'''Wow, Ken - you are strong!'''\\
[[http://randomhoohaas.flyingomelette.com/gw/otimusya/hokutonoken/hokuto8.gif One punch can burrow a hole through a man's chest - such is the strength of Hokuto Shinken.]]\\
'''Wow, Ken - you are amazing!'''\\
[[http://randomhoohaas.flyingomelette.com/gw/otimusya/hokutonoken/hokutonoken10.gif And if Ken succumbs to his foes, he flails through the air kicking like a baby.]]\\
... oh.\\
'''Wow, Ken - that was pretty shitty!'''
* There are generally three known exceptions to Wiki/ThisVeryWiki's rule against authors adding stuff to or otherwise editing their own YMMV pages:
** They may move misplaced examples from the main page to the YMMV page.
** They may remove any entry that is factually untrue.
** They may add input from other parties, if the other parties consent or else are unable to edit the YMMV page in question for whatever reason. This one is in more of a gray area than the other two, though.
* In ''WebVideo/JonTron'''s review of ''VideoGame/{{Nightshade}}'', after being tricked by the game three times, he gives a modification of the phrase "Fool me once" to make it three times:
-->''Fool me once, I'm mad. Fool me twice, how could you. Fool me three times, you're officially that guy, okay, you know the one. The one who goes to the bar and is like "This suit is, uh, officially it's a Giorgio Armani, ech, my dad knows him". FUCK YOU! '''I AIIIIIIN'T HAVIN' THAT SHIT!'''''
* ''WebVideo/AnalystBroniesReact'': When reacting to ''Equestria Girls Friendship Games'':
** Keyframe is not happy that Twilight only walked through two doors that made {{lens flare}}.
--->'''Keyframe:''' My rule of three is not satisfied.
** [=CellSpex=] has three things she wants from ''Friendship Games'':
--->One, I wanna see human Cadence and Shining Armor. Number two, I wanna see Sunset revert back to her demon form. Number three, I need to see Human Twilight shun Flash Sentry! Bonus 50 points if she calls him a stalker!

[[folder:Western Animation]]
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** Each of the mane ponies' cutie marks have something to do with the number three. Applejack, Rarity, Fluttershy and Pinkie Pie have three apples, gems, butterflies and balloons as their cutie marks respectively. The lightning bolt on Rainbow Dash's cutie mark is composed of three colors.
** Also, all of the lead characters barring Twilight Sparkle have exactly three syllables in their names.
** Also applies to the Cutie Mark Crusaders. There are three of them, and all three have names that consist of three syllables.
** There are three types of ponies (Earth ponies, Unicorns and Pegasi), and both the mane cast and the Cutie Mark Crusaders are made up of an even balance between these types. With the two groups combined, there are three of each.
** Story-wise, many episodes rely on a minimum of three ponies regardless of how many are the actual focus characters -- "Look before you Sleep", based around Applejack and Rarity, adds Twilight Sparkle to the mix, and "Putting your Hoof Down" has Rarity and Pinkie Pie in a Fluttershy ep. This often ties in with the concept of the FreudianTrio, especially in Season 1 episodes where Twilight Sparkle usually acted as the Ego (such as "look before you sleep" where Applejack was the Id and Rarity was the Superego). The show likes to invert the freudian trio a lot too, where the central character's behavior is out of balance and two other characters will try to correct them.
** In ''[[Recap/MyLittlePonyFriendshipIsMagicS4E23InspirationManifestation Inspiration Manifestation]]'', Spike's description of Rarity's first puppet theater, {{lampshade|Hanging}}d with Spike counting to three on his claw afterward.
-->'''Spike''': So that puppeteer didn't like your exquisitely crafted best puppet theater in the history of puppet theaters puppet theater.
** Averted in “Pinkie Apple Pie” where a running gag had an eagle showing up randomly and taking animals off screen to their doom.
* In one ''WesternAnimation/TinyToonAdventures'' short, a clown runs by in the background three times. After the third and final time near the end of the cartoon, Babs dryly explains he's "a RunningGag". The plot of the episode is about Buster's quest to revive a joke he's driven into the ground (represented by a clown in a grave...morbid). The joke has this trope too: "A duck, a rabbit, and a pig go to a restaurant..."[[note]]"...which hand do they use to eat their soup? Neither! They used a soup spoon!"[[/note]]
* In ''Anime/TransformersArmada'', there are three legendarily strong weapons formed by the combination of three Mini-Cons apiece... Caused partly by the MerchandiseDriven nature of the series, as Mini-Cons were sold in teams of three. Also, the Mini-Cons added a third unique group of transformers alongside the Autobots and Decepticons -- as witness their unique emblem.
* ''Triple Threat -- Rail Racer!'' And the original Triple-Changers came in sets of 3, and the Unicron Trilogy (and Headmasters) tended to have 3-kid sidekick teams. Transformers is _mostly_ based around the number 2, though.
* Lampshaded and Subverted in ''WesternAnimation/{{Duckman}}''. While looking for suspects at a nightclub, Duckman says "Something bugs me. He's the third suspicious character we've talked to, and the third one is always guilty". The lights go out, shots are heard and when it's over the suspect is dead on the floor. Cornfed observes "So much for the Rule Of Three."
* ''WesternAnimation/{{Animaniacs}}'':
** In a short: "Tea? Coffee? Monster?"
** Another example: Slappy is eulogizing her archfoe Walter Wolf, who was faking the funeral to 'get' her. According to Slappy, Walter was a firm believer in this rule, including three bombs that were found lying around to blow her up. 'I'm sure he'd want to be buried with it.'
* Averted on ''WesternAnimation/ExtremeGhostbusters''. "On the count of three." "Three!"
* In one episode of ''WesternAnimation/{{Freakazoid}}'', the eponymous character is picked up by a holographic pterodactyl and dropped from an extreme height, and he screams for help every time he falls. Lampshaded the third time when he and the Lobe fall together:
-->'''The Lobe:''' Freakazoid, why is it taking us so long to fall?
-->'''Freakazoid:''' [[RuleOfFunny Cuz it's funny!]]
-->'''The Lobe:''' No it's not, it's just stupid! It's as dumb as that Handman episode!
* ''WesternAnimation/SouthPark'':
** "Biggie Smalls. Biggie Smalls. Biggie Smalls."
** South Park also did it in the Imaginationland episode:
--->"Sir, we have a security breach!"\\
"There's an Unauthorized Entry Alert! It's coming from Sector Two!"\\
"Sector Two??"
** Cartman then jumps in through a window. The second time the above dialogue occurs, Cartman again jumps in through the shoddily repaired window. The third time it happens, Kyle jumps in through the remnants of the window, causing the general to exclaim, "Why is it so easy for children to break into the Pentagon?!"
** Also in the episode "Two Days Before the Day After Tomorrow" after Stan, Kyle, and Cartman leave, Randy volunteers to go after them, whereupon he is told "You can't go, you'll freeze to death!" whereupon Gerald volunteers to go, and is told "You can't go, you'll freeze to death!". Cue a third random person volunteering and a third random person reluctantly saying "You can't go, you'll freeze to death."
* ''WesternAnimation/SchoolhouseRock''[='=]s first song was about the three times tables. Hilariously, it was called "Three Is a Magic Number". It was full of all kinds of examples.
* In ''WesternAnimation/{{Futurama}}'': One spoonful calms you down, two spoonfuls help you sleep, but three spoonfuls, you'll [[NeverSayDie go into a sleep and never wake up! Never!]]
--> "Oh Fry... I love you more than the moon and the stars and the [[RoboSpeak POETIC IMAGE NUMBER 37 NOT FOUND]]"
* On ''WesternAnimation/TheFairlyOddParents'', an episodes RunningGag is used three times. Also, in the "Wishology" trilogy, three wands were eventually needed to defeat [[BigBad The Darkness]].
* In the fourth season of ''WesternAnimation/WinxClub'' there are three eternal fairies that give the girls the three gifts of destiny.
* Lampshaded in an episode of ''WesternAnimation/DrawnTogether'', when Wooldor describes what his television show will do. In his words, it will "Entertain kids, annoy adults, and funny third thing!"
* Also {{lampshade|Hanging}}d in ''WesternAnimation/TheSpongebobSquarepantsMovie'', during [=SpongeBob=]'s speech at the end of the film:
-->'''[=SpongeBob=]''': And no amount of mermaid magic...or managerial promotion...or some other third thing...
* ''WesternAnimation/TheCritic'' uses the same joke in this case: To prove to Jay that he's being repetitive, his boss Duke shows him a video of him hosting his show ''Coming Attractions'', [[http://www.youtube.com/watch?v=yPBTE0wlZF4 but with the screen split into thirds.]]
-->'''Jay:''' ''(section 1, from 1988)'' ''Film/RainMan'' ''(section 2, from 1992)'' ''Film/AFewGoodMen'' ''(section 3, from 1993)'' ''The Firm'' ''(all together)'' is the latest stinker from Creator/TomCruise. He doesn't act anymore, he's on ... Cruise Control! AAAAAAHAHAHA! AAAAAAHA! I JUST ... I JUST! MADE THAT! UP!
* Examples from SpeakOfTheDevil include the ''WesternAnimation/{{Freakazoid}}'' "Huggbees", ''WesternAnimation/{{Beetlejuice}}''.
* Combined with InherentlyFunnyWords in ''WesternAnimation/ThePJs''. Thurgood is [[ItMakesSenseInContext working on a stand-up act]] and the book he got on how to be funny says things in three are funny as well as words with a hard k in them (like knish, tukas, fakakta). He logically assumes then that the funniest thing ever [[RefugeInAudacity is KKK]].
* ''WesternAnimation/FamilyGuy'' uses this trope liberally for their gags. DVDCommentary also states the trope name for when a comedy uses a gag that involves three things.
* In ''WesternAnimation/DoraTheExplorer'', there are usually three places that the characters have to go in each episode, with the exception of certain double-length installments. Also, saying SwiperNoSwiping three times stops Swiper, though if the characters aren't able to manage it in time, then he declares that they're [[YouAreTooLate too late]] and swipes.
* ''WesternAnimation/RobotChicken'':
** The Creator/DCComics special. ComicBook/{{Bane}} repeatedly turns up suddenly and breaks Batman's back, followed by a hilarious music sting. (Dumdedum dum dee THAT'S BANE!) He does this the expected three times... then a fourth, to which Batman screams "RULE OF THREE, ASSHOLE, NOT RULE OF FOUR!"
** In one sketch, a boy is hospitalized three times whenever he goes onto a road to retrieve a soccer ball and gets hit by a car each time. The first time he's left mute, then he becomes deaf, then he just gets brain damage.
** One sketch has an inventor building a time machine with the intention of going back to see the dinosaurs. Instead, he ends up getting sent back to the presidential assassinations of Lincoln, JFK, and Reagan and ends up getting shot himself each time. On the fourth attempt, he goes back and sees a T. rex... [[RuleOfFunny who pulls out a handgun and shoots him]].
* Mentioned by name in the ''WesternAnimation/SonicBoom'' episode "Mayor Knuckles".
* In ''WesternAnimation/ThomasTheTankEngine'', From season 8 onward (Sharon Miller's tenure as head writer), almost all plots follow this, where a character must make one mistake three times in a row before realizing what they did wrong, and then things get {{Anvilicious}}. Many fans have referred to this as the "Three-Strike Formula". This got toned down by Season 17, when Andrew Brenner took over as the head writer.
* ''WesternAnimation/WishKid'': To trigger the glove's wish-granting power, the user must punch it three times. Nick usually says his wish once for each time he hits the glove but it's revealed in at least two episodes that what really matters is the wish mentioned during the third time. Mrs. Opal must have figured the rule of three is somehow a part of how the glove works as she once tried to become Miss America by stating her wish three times with the glove on her head.
* ''WesternAnimation/YogisGang'': In "Mr. Fibber", there are three times when Yogi is asked to land because of some emergency. He initially refuses during the third time because [[CryingWolf the other two turned out to be lies]].
-->'''Yogi Bear:''' You fooled me twice. Three times isn't nice!
* ''WesternAnimation/PennZeroPartTimeHero'': In "3 Big Problems", one of the missiles that Rippen launches at the heroes crushes three buildings, the third of which is named "Rule of 3".
* The Trollhunter from ''WesternAnimation/{{Trollhunters}}'' lives and dies by three rules:
** RuleNumberOne: [[FearIsTheAppropriateResponse Always be Afraid]].
** Rule Number Two: [[GainingTheWillToKill Always finish the fight]].
** Rule Number Three: [[GroinAttack When in doubt, always kick them in the gronk-nuks]].
* In ''WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius'' episode "Crunch Time", Jimmy prepares three batches of his homemade candy before he perfects it. The first batch Carl and Sheen like for a few seconds before it goes bad and they spit it into the garbage, the second batch causes them to spontaneously grow facial hair, and the third batch [[MadeOfExplodium explodes]].
* In one episode of ''WesternAnimation/HarveyBirdmanAttorneyAtLaw'', Harvey keeps waking up to find the heads of Creator/HannaBarbera characters at the foot of his bed a la ''Film/TheGodfather'': first it's WesternAnimation/QuickDrawMcGraw, then an apparently still alive WesternAnimation/{{Jabberjaw}}, then [[WesternAnimation/TheHerculoids what is either Gleep or Gloop]].
* In the ''WesternAnimation/MiloMurphysLaw'' episode "The Race", Milo attempts to grab a cup of water from a table provided for competitors in the eponymous race. Due to MurphysLaw, the first cup he grabs has the water fall through the bottom, the second gets stolen by a bird, and when he tries to grab a third, the whole table collapses.
* ''WesternAnimation/ThePowerpuffGirls'' has the three main protagonists Blossom, Bubbles and Buttercup.
* ''WesternAnimation/StevenUniverse'': Discussed in "[[Recap/StevenUniverseS3E20Bismuth Bismuth]]". After a second "Bismuth/business" pun, Amethyst complains that they already did that joke, to which Steven points out that the third time it happens it'll be ''really'' funny. [[spoiler:It does happen a third time, and ''[[MoodWhiplash it's not funny at all]]''.]]
* ''WesternAnimation/{{Kaeloo}}'': In "Let's Play Guess Who!", Bad Kaeloo beats Mr. Cat up three times. As it is about to happen the third time, Mr. Cat even lampshades how it had to be done three times.

[[folder:Real Life]]
* Body, Mind, Soul. Are the last two one and the same? Depends on whom you ask.
* Birth, Life, Death.
* Past, Present, Future.
* [[LandSeaSky Land, Sea, Sky.]]
* Lithosphere, Hydrosphere, Atmosphere.
* Breakfast, Lunch, Dinner. Averted in some countries, like in France, where you get "le goûter", or "the afternoon snack" (around 4:00 PM), which counts like mealtime.
* Three primary colors.
* Three domains (highest rank in taxonomy)
* Three point one four.
* Who hasn't heard this? "Okay ready? OnThree..."
* Survival's Rule of Threes for the untrained folk: Three seconds without blood (flow), three minutes without air, three hours without warmth, three days without water, three weeks without food, three months without love.[[note]]You may think the latter one is a joke, but it's not. People who become isolated, say from being shipwrecked, will go through a crisis about three months in. They may have all they need in terms of shelter, food and safety, but without fellow human beings, they're likely to stop caring for themselves, lay down and die. A small proportion of people can live as hermits; they're the exception. There's a reason [[Film/CastAway Wilson]] was so important.[[/note]]
* In the Netherlands at least (possibly also in other European countries?), there's a figure of saying / superstition that when you sneeze three times, it predicts good weather.
* There is a saying "One time is chance, Two Times is a coincidence, Three times is suspicious/a conspiracy" which suggests that 3 times is the least amount of times something has to happen before it is established as something more than coincidence. In the UK, it's "once is happenstance, twice is coincidence, three times is enemy action". At least one James Bond story was built on this: Goldfinger, where Auric refers to this (the UK variant stated above) as being a phrase from Chicago. The US military teaches a similar pattern regarding predictable behaviors like patrol schedules and routes; First time, you're seen. Twice is a pattern. Third time, you're dead.
* In the UK, the school year is traditionally divided into three terms: Winter, Spring, and Summer (or Michaelmas, Hilary, and Trinity (or even Michaelmas, Lent, and Easter) if you go to an old established school or university).
* Same thing in India, except it's called [[ExactlyWhatItSaysOnTheTin 1st Term, 2nd Term, and 3rd Term.]] There are also three big exams each year, known as end-of-term exams or simply term exams, and three sets of holidays following the end of each term. The third one is the big summer vacation, which marks the end of the school year.
* Apparently the United States Marine Corps [[http://www.washingtonpost.com/wp-dyn/content/article/2005/10/25/AR2005102501550.html uses it too]] (albeit with the fire team level as an exception). This is referred to as "triangularization" and was adopted by everyone from the German Wehrmacht in the 1930s. Previously, it was the rule of fours.
* In UsefulNotes/{{NASCAR}}, there has been a coincidence that every three years from Dale Earnhardt's 1998 Daytona 500 victory, someone close to him won the Great American Race: Michael Waltrip (DEI driver) at the race where Earnhardt died in 2001, Dale Earnhardt, Jr. (his son) in 2004, Kevin Harvick (his replacement at Richard Childress Racing) in 2007, and Jamie [=McMurray=] (Earnhardt Ganassi driver) in 2010. A number of teams operate in the Sprint Cup Series with three teams: for instance, Roush Fenway has three teams (Matt Kenseth, Greg Biffle and Carl Edwards), as does Richard Childress (Paul Menard, Kevin Harvick and Jeff Burton).
* The Rock, Paper, Scissors game (or Stone, Scissors, Paper, depending on where you are). Or the Malay version, which uses bird, water, rock.
* Look up any Weight Training routine, a vast majority of them will consist of each exercise being 3 sets of ''x'' reps, with 3 sets of 10 being the most popular.
* Listing things in groups of three for emphasis is generally considered a useful technique for giving a speech. Though it's often subverted by repeating the ''same'' thing, three times. One of the better examples was Tony Blair's declaration that his three priorities for government were, "Education! Education! Education!"
* There's Stephen King's famous advice to wannabe writers: "Read, read, read! Write, write, write!"
* Danton's speech before the legislative assembly on September 2, 1792: "Gentlemen, what is needed is audacity, audacity again and audacity always, and France is saved." (''Messieurs, il faut de l'audace, encore de l'audace et toujours de l'audace et la France est sauvée.'')
* Count Raimondo Montecuccoli (1609–81), who wrote that to wage war you need three things: Money, money and money.
* The three most important things to remember about real estate purchases: "Location. Location. Location."
* Ancient Jewish and Arabic custom allowed a man to divorce his wife by simply declaring 'I divorce you' thrice. It has resulted in at least one incident where a man [[http://www.boston.com/news/odd/articles/2006/03/28/man_accidentally_divorces_wife_in_sleep/ accidentally divorced his wife.]] (Or well, almost divorced her; turns out Islamic law, like any other half-decent legal system, does not allow you to make decisions like that while you're asleep.) While not current in divorce, three is still important in Jewish court matters. The smallest size of a court is three (since it's the smallest plural odd number, meaning no ties). Also, ''Hataras Nedarim'', a process done on Rosh Hashana Eve, involves collaring three friends who sit as a court and asking them that one's unfulfilled promises be annulled. The "court" repeats a small passage three times which effects the annulment. Similarly, a shorter version involves just saying the words "''mutar lach''" (you are released) three times. And there are three basic duties of a Jewish husband toward his wife -- feeding her, providing her with cover, and satisfying her sexually. It's also common for courts other legal systems to use three judges, such as the Magistrates' Courts in the United Kingdom.
* In sports, there's the Triple Crown (horse racing), and the "hat trick" (various sports, all involving 3 of an action, usually but not exclusively scoring). Also (in Baseball) the Hitting Triple Crown -- highest batting average, most home runs, most runs batted in -- and the Pitching triple crown: most wins, most strikeouts, lowest earned run average. There is also the Rugby Union Triple Crown, fought out (as part of the annual six nations games) between England, Scotland, Wales and Ireland. The result is settled after each of the four teams has played three matches (one against each of the other three), hence the name.
* Baseball seems to run on this trope. Here are some examples:
** 3 strikes and you're out.
** 3 outs per inning.
** 3 bases plus home.
** More than 3 balls is a walk.
** Thrice 3 innings in a game (without extra innings due to a tie).
* In Cricket there's the hatrick: 3 wickets, 3 consecutive balls.
* In American football, any score on the free play after a touchdown is worth one third of the normal value.
* In basketball, the most points you can score with one basket is 3 points. There's the triple-double, for getting 10 or more in any three stats: usually points, assists and rebounds. (Technically, more than triple is possible, but triple is the most commonly talked about "limit", since steals and blocks are difficult to get 10 or more of.)
* In bowling, three consecutive strikes is called a "turkey", and it's possible to bowl three times in the tenth frame, if you score a strike or a spare.
* The Roman orator Cicero often used trios of phrases when wanting emphasis in speeches. While he may not have initiated the habit, many, many admirers picked it up.
* Averted by UsefulNotes/WinstonChurchill upon becoming the UK's Prime Minister: "I have nothing to offer but blood, toil, tears, and sweat." But this trope is probably why it's usually quoted as "blood, sweat and tears."
* As mentioned on [[Wiki/{{Wikipedia}} The Other Wiki]], UsefulNotes/AbrahamLincoln used the tricolon in more than one of his speeches, including the Gettysburg Address. "But, in a larger sense, '''we can not dedicate...we can not consecrate...we can not hallow''' this ground." "Government '''of the People, by the people and for the people''' shall not perish from this earth".
* A number of nations or states use the rule of three for their mottoes, such as the French ''Liberté, Egalité, Fraternité'' (Freedom, Equality, Fraternity) or the Congolese "Justice, Paix, Travail." (Justice, Peace, Work). During UsefulNotes/WorldWarII, the [[LesCollaborateurs Vichy regime]] adopted a new motto: ''Travail, Famille, Patrie'' (Work, Family, Country). Of course, things were pretty bad in France, so LaResistance and various wags turned it into ''Trouvailles, famine, patrouilles'' (Lucky finds, famine, patrols).
* From the Declaration of Independence, "Life, Liberty and the Pursuit of Happiness" (borrowed from John Locke, who used "Life, Liberty and Property")
* And the German ''Einigkeit und Recht und Freiheit'' (Unity and Justice and Freedom).
** The Nazi Regime was called the Third Reich.
** ''"Ein Volk, ein Reich, ein Führer''". [[UsefulNotes/DichterAndDenker One people]], [[UsefulNotes/NaziGermany one empire]], [[UsefulNotes/AdolfHitler one leader]]. Which may owe something to a slogan from the French ancien régime: "Un roi, une loi, une foi." (One king, one law, one faith.)
** From an earlier time in German history: ''Kinder, Küche, Kirche'' (the proper concerns of women: children, kitchen, and the church)
* Lotsa "Three Strike" systems when it comes to rules in general. Two warnings, and the third time is when the proverbial poop hits the fan.
* Hockey goaltenders may be pulled from a game after allowing three goals. And the game is divided into three periods. And the aforementioned hat trick of one player scoring three goals in one game.
* There are lots of threes in the human body:
** Three bones in the ear (hammer, anvil, and stirrup), three types of muscle (smooth, skeletal, and cardiac), three layers in the skin (epidermis, dermis, and subcutis), three types of blood cells (white, red, and platelets), hair can be divided into three parts (bulb, root, shaft)... Also, all organ systems arise from one of three primary germ layers in embryonic development -- the ectoderm, the mesoderm, and the endoderm.
** Insect anatomy -- head, thorax, abdomen.
* In mathematics, there are three basic ways to approach a problem: graphically, numerically and algebraically. This is sometimes even called the Rule of Three. In the same vein, most countries teach the topic of Speed, Distance and Time all at once, often arranged into a triangle of three.
* The saying 'Third time lucky!' -Which is the idea that if you fail twice, you will succeed the third time, not that it's actually true. It's also heard as "Third time's the charm!" in America.
* SexDrugsAndRockAndRoll.
* Black, blanc, beur (africans, europeans, arabs): motto parodying the colors of the French flag in order to celebrate the cultural diversity of France.
* The powers of a State, are commonly divided in: Judicial, Executive and Legislative. The legislative process in the US has to be approved in three stages: the House of Representatives, the Senate, and the President. In the UK it's the House of Commons, the House of Lords, and the Queen (or in old terminology: "Crown, Lords, and Commons"). In both cases, the former two can be swapped around.
* Several of the US space shuttle orbiter's systems are triply redundant, notably the Space Shuttle Main Engines, the fuel cells which generate electricity, and the auxiliary power units which provide hydraulic pressure to manipulate the orbiter's aerosurfaces and gimbal the three main engines.
* The signal for Help in Morse code consists of three letters (SOS) and each letter is composed of three dots or dashes. Three somethings is a convention for a disaster signal: three fires, three gunshots, [[Series/GameOfThrones three blasts]]...
* Next time someone comes to your door, see if they knock in groups of three.
* Medical schools operate on the principle of "first you watch a procedure, then you perform it, then you teach someone to do it".
* The three kinds of science: Life, Physical, and Earth. And then [[SixthRanger social]]. Social sciences are usually grouped as Anthropology, Psychology, and Sociology, as well. Alternatively, the three pure natural sciences: Physics, Chemistry and Biology.
* Chess is defined as a subtle mixture of sport, art and science (the three areas of knowledge).
* There are three kinds of tectonic plate boundaries: convergent, divergent and transform. Within that, there are three kinds of convergent boundaries as well.
* The Mozambique Drill follows this for close quarters combat. Two quick shots to the torso, followed by a slower and more well-aimed headshot to stop the target.
* In Athenian democracy, Kleisthenes created a new kind of subdivision of the city's territory and free population called the ''phylai'' in order to create a stronger sense of belonging together. Each ''phyla'' consisted of a district of the city of Athens, one of the coastal and harbour region, and one of the inland agricultural region, Attica.
* In many pre-modern Europe that part of society that had the right to participate in government (legislature) in some form was usually divided into three estates -- clergy, nobility, and the rest.
* Appears quite a bit in the United States Constitution. First, there are classes of senators. Three of them. Senators of each class are elected on different election years (but always even years, unless a senator dies in office). (For the record, should a [[SixthRanger fifty-first state]] be added, its senators would be in the first and second classes.) There are also nine Supreme Court Justices.
* It's taught as a rule of drafting in some law schools on the basis that it emphasizes that you are covering everything relating to a particular topic. For example a costs indemnity will often read "[Party A] will indemnify, reimburse and hold harmless [Party B] against any losses, costs or expenses [Party B] may incur, suffer or bear..."
* In C++ programming, it is considered poor practice to define a destructor, copy constructor, or copy assignment operator without assigning the other two; this is actually called the "rule of three" in the [[ExpoSpeak thrilling world of C++ jargon]]. [[{{Infodump}} The reason for this]] is that the compiler usually creates these functions automatically, and the only reason that the programmer should define one is also the reason to define the others. As of C++11, ([[ExactlyWhatItSaysOnTheTin the 2011 version of the C++ language]]), this has been expanded into one of the variations on this trope (the rule of five), adding a move constructor and move assignment constructor to the original three.
* Research into short term memory has in fact determined that memorizing in groups of three is the easiest among all combinations.
* Generally, the slot machines of most pubs and clubs incorporate this with the RuleOfSeven, whereas scoring triple sevens nets the biggest jackpot.
* Groups of three supposedly have some kind of special significance in Russian culture...allegedly because during Soviet times when things were cheaper if three men each contribute a rouble they could buy a handle of vodka to share and then have exactly enough kopeks left over for zakuski (snacks). (Ok, not quite as noble as the French or German examples, but practical..) Even earlier were the [[KangarooCourt Troika tribunals]].
* "Leaves of three, let it be." for avoiding poison ivy. And poison oak. Also, poison sumac.
* Franz Boas defined three types of anthropology: Ethnology (later split into social and cultural anthropology), physical anthropology, and linguistic anthropology. [[SixthRanger Archaeology was folded into anthropology later.]]
* In computer engineering, there's this: if a CPU encounters an exception, it calls an exception handler routine. If the handler encounters an exception itself, the CPU calls a special handler. But if the special handler too encounters an exception (such as the interrupt descriptor table being corrupt, making it impossible to call any handlers), that's called a triple fault and the CPU shuts itself down. Some kernels like Linux use it as a last resort in case the PC goes completely bonkers: if an ACPI reboot fails, the kernel sets the IDT length to zero, making the table impossible to access and ''[[LogicBomb intentionally triple-faulting the CPU]]''. Not exactly to spec but it works.
* [[InvokedTrope Attempted]] and [[SubvertedTrope failed]] by Rick Perry during the Republican Presidential Debate of November 9th, 2011. Governor Perry said that as president, he would eliminate three government agencies: [[http://www.youtube.com/watch?v=zUA2rDVrmNg "Commerce, Education, and the-um, uh what's the third one there? Let's see..."]]
* Quantum Chromodynamics states that each quark, the elementary particles of which hadrons are made, carries an electric charge which is a multiple of a third of the elementary charge; that each quark is one of three 'colours'; that quarks, like all elementary particles, come in three families; and much of a quark's characteristics is based on a unitary group, a mathematical construct, called SU(3).
* OlderThanFeudalism: In AncientRome, many legal matters were performed by simply stating what you were doing thrice in front of witnesses, i.e. if you were marrying someone, you would say "I marry you" thrice.
* At the beginning of World War 2, RAF fighters generally operated in groups of three. However it was discovered that in combat one pilot would become separated from the other two and fall easy prey to enemy fighters. They then adopted the Luftwaffe's system of groups of four which in combat could easily sub-divide into two groups of two.
* Internet Explorer, Chrome, Firefox ([[MyFriendsAndZoidberg Opera, Safari, Maxthon, SeaMonkey, xxxterm...]]).
* When challenging someone to recite a TongueTwister, it's common to dare them to say it three times fast.
* One that's pretty famous; Veni, Vidi, Vici. I came, I saw, I conquered.
* A killer isn't considered a Serial Killer until after they have killed 3 people.
* On [[Wiki/{{Wikipedia}} The Other Wiki]] it says that the UN considers a mass grave one that holds at least three execution victims.
* On a PBS documentary on Creator/JDSalinger one speaker said that one assassin using [[Literature/TheCatcherInTheRye a book]] to justify themselves is just "crazy" while ''three'' makes one wonder [[MyGodWhatHaveIDone what on earth they had done]] (the guy described it like "voodoo" -- Salinger "put his depression into Holden", unstable readers internalized it then concluded that "all phonies must die").
* Neutrons, protons and electrons, as the common elementary particles forming all ordinary matter. They were also thought of as the only elementary particles until [[TheForties the late Forties]], when other particles were first discovered. And since TheSeventies), three families of quarks and leptons.
* Nikola Tesla was obsessed with the number three. He did everything in numbers divisible by it.
* The common cold: Three days coming, three days staying, three days going. It's a pretty handy mnemonic and not inaccurate.
* The 3 main TV networks of the US: NBC,CBS and ABC (Fox and UPN/WB/CW came later and are still kinda second to the 3 big ones). In Britain for about 30 (3x10) years from the mid-[[TheFifties 1950s]] to the mid-[[TheEighties 1980s]], there were three TV channels; BBC One, BBC Two and ITV.
* The two trinities of forensics/criminalistics: means, motive and opportunity, and victim, suspect, crime scene.
* The classic (half-joking) declension; "I am ''firm'', thou art ''obstinate'', he is ''pig-headed''." Related to the ''Series/YesMinister'' joke under Live-Action TV above.
* Three dimensions of space (that we know about, anyway).
* Tricolour national flags are very common: Russia, Germany, France, Italy, Colombia. Even when the design is different, many national flags don't have more than 3 main colors.
* There's a [[http://en.wikipedia.org/wiki/Project_management_triangle sort of triangle in projects]]: Time, Quality, and Money, also known as 'Fast, Good, Cheap'. Pick two. You can get something good done cheap if you're willing to wait; you can get something good done ''fast'' if you're willing to ''pay'', and if you're not willing to put in the time or money, don't expect it to be any ''good''. A variation for the lives of college/university students: Good grades, enough sleep, and a social life. You can only pick two.
* One of the most famous quotes of UsefulNotes/VladimirLenin is 'Учиться, учиться и ещё раз учиться!' ('Learn, learn and learn!').
* Following World War II and the creation of NATO, its various member states created the "Big Three" CoolGuns/BattleRifles -- the Belgian FAL, the American M14, and the West German G3.
* There is an old belief that [[HollywoodDrowning a drowning person]] would manage to [[LastGraspAtLife resurface three times]] before finally succumbing.
* The gold, silver, and bronze medals in the Olympics.
* A good way to remember what "third party" is in terms of your liability insurance: First party is the insured. Second party is the insurance company (the insurer). Third party is everyone else.
* Used extensively in Military and Emergency Services as a way to ensure that certain things are heard, some examples include:
** "EjectEjectEject": Military Pilots shouting this have every intention of Ejecting from their aircraft. Shouting it three times serves three main purposes:
*** To make sure that no single utterance of the word results in someone initiating the Ejection sequence (and throwing away a perfectly good plane)
*** To make sure all crew-members hear it, and no one gets left behind (not all crew in some military planes can simply Eject, and must bail out the old fashioned way).
*** So that their Command knows that they are bailing out, and can get Search and Rescue to start looking for them.
** Fighter Pilots will sometimes do this when using their weapons, but not always. One example is the call "Guns Guns Guns", which is the call to let everyone know that you are firing your guns at a target.
** In policing, some precincts practice a rule of calling out "Shots Fire" three times to avoid any confusion over the radio. Something that has cost some police officers their lives waiting for back-up because Dispatch didn't hear the radio call.
** Some Fire Departments use a similar method to the Eject call mentioned above, in this case, if someone shouts "Evacuate" three times over the radio (followed closely by an evacuation horn blaring three times), it's a clear warning to those inside (or on the roof) that the building in question is about collapse, and that they should [[UnderStatement leave the building]].
** In Hospitals, some codes must be repeated when called out. These are typically the more life-threatening ones such as "Code-Blue" (Cardiac Arrest), but the reasons are the same as before: To ensure that it's been heard.
** "Mayday, mayday, mayday" as a distress signal in aviation is similarly repeated three times to ensure that the call for help is understood and not in error.
* Historically, judges sentencing prisoners to death by hanging would decree that they hang by the neck until "dead, dead, dead!" Contrary to popular belief, infamous HangingJudge Isaac Parker never followed this practice.