Most times, jokes come and go; they get their set up, make you laugh, and then they're done and you move on to the next joke. But sometimes, jokes aren't done with you. Sometimes, you find yourself not only going back to the joke, but having it bring a whole new twist - the first joke wasn't just a gag, but also set up for something else that blindsides you later on. It's ChekhovsGun being used as a joke in its first appearance.

This can happen in any span of time, in a single episode (usually very beginning to the very end), in several episodes, or even whole seasons.

The first gag is always a set-up for whatever will happen later, though ideally it doesn't seem that way at first. If it isn't, then it's a regular RunningGag. If the setup is played out to be a WhatHappenedToTheMouse moment, only for it to have closure later, then it's a BrickJoke. See also JokeAndReceive, which might have an immediate payoff courtesy of the universe that the joker wasn't expecting.

'''This trope contains spoilers by necessity. Read at your own risk.'''


[[folder:Anime & Manga]]
* ''Manga/{{Naruto}}'' has the Harem Jutsu. Introduced in the second chapter, a gender-bent version is used against the Big Bad, Kaguya Ootsotsuki '''680''' chapters later. The real kicker is, ''it works''. Albeit, it distracts Kaguya by causing her to be DistractedByTheSexy rather than causing her to ''totally'' perv out, but it still lets them get their first actual hit in against her.
* In Episode 24 of ''VideoGame/InazumaEleven'', as Endou is preparing for an overnight training camp, a brief comic relief scene occurs where his mom hands him a pair of boxers with his name written in marker ("En" on the left butt cheek and "dou" on the right in ''really'' big handwriting, no less) to make sure he doesn't get his laundry mixed up with any of his teammates. Seven episodes later, Touko barges in on the boys changing, and gets an eyeful of Endou in his underwear - and he's actually wearing that very same pair of boxers.
* ''Manga/OnePiece'':
** [[ChewToy Sanji's]] dream to meet a mermaid turns into a nightmare when he finally meets one -- [[{{Gonk}} Kokoro]], [[LadyDrunk who isn't exactly a young]] [[{{Gonk}} or pretty mermaid]]. Later on, the crew meets another mermaid, Camie, and this meeting is [[BrainBleach ridiculously funny]] ''because'' of their earlier meeting with Kokoro. To clarify, his meeting with Camie (who is rather attractive) retroactively erases all memories he ever had of Kokoro (who is not).
** Luffy spends a lot of the earlier episodes asserting that their next crew member needs to be a musician, over things like a doctor or a cook. Sure enough, 300+ episodes later, the 9th Straw Hat pirate is Brook, an undead musician.
** During the Water 7 arc:
--->'''Luffy:''' Hey Zoro, why were you running away from the storm?\\
'''Zoro:''' Oh, it's nothing. Forget it.\\
'''Chopper:''' He was stuck inside a chimney.\\
'''Zoro:''' Why you, Chopper!
** Later, during the ride to Enies Lobby aboard the sea train Rocketman:
--->'''Zoro:''' Hey, I don't see Luffy. Where did he go?\\
'''Chopper:''' Maybe he got stuck in the chimney of the Rocketman.\\
'''Zoro:''' Chopper, shut up!
** When the World Government produces Sanji's wanted poster, instead of his photograph (the photographer accidentally left his lens cap on), there is a rather badly-drawn sketch of what officials ''think'' he looks like. This causes Duval to bear a grudge against Sanji, as his real face looks just like the sketch on the wanted poster, causing people to beat Duval up and arrest him for nothing he ever did, mistaking him for Sanji. Much later, the oddities with Sanji's wanted poster continue when it's simultaneously updated to include a proper photograph of him and an instruction that he's to be taken alive only (instead of the more typical Dead or Alive).
** A LivingToy in Dressrosa working as a waiter is absurdly evasive about the so-called fairies on the island, to the annoyance of people who talk to him. This is actually because these fairies, the Tontattas, are in an alliance with the toys on the island in a plot to overthrow the current king, hence the waiter toy remaining hush-hush to those not part of the alliance.
** Gladius is shown in one of his earliest scenes to get so angry at one of his comrades that he blows his top, causing his hat to explode as a sight gag. It turns out, many chapters later when he actually gets serious in battle, that he has the ability to inflate any non-living thing that comes in physical contact with him until it pops, including the landscape around him, making that first scene a hint to his PersonOfMassDestruction nature.
* ''Manga/DailyLivesOfHighSchoolBoys'': In an early skit ''High School Boys and Scary Stories (2)'', Hidenori mentioned Karasawa was "experienced in scary tales," and Tadakuni made up a story on how he saw what was under Karasawa's [[NeverBareheaded cap]], remarking that it was hilarious. It's nowhere near funny at all, as his backstory unfolded: he was covered with scars--including an ugly scar on his forehead that he wears a cap to cover. These scars were courtesy of Habara, the girl who lives next to him and, eight years ago, was an EnfantTerrible-level [[TheBully bully]].
* In ''Manga/FullmetalAlchemist'', when Lieutenant Hughes constantly discusses his wife and daughter, Colonel Mustang jokes that in war movies, the guy who's obsessed with his family always gets killed first. At first just an innocent joke, then it actually happens and [[FunnyAneurysmMoment isn't so funny anymore.]]
* ''LightNovel/HaiyoreNyarkoSan'':
** Happens all the time, as the most inconsequential remarks and jokes often turn out to be the lynchpin of the plot (to the growing frustration of the OnlySaneMan male lead, Mahiro). In particular, a second season episode has Nyarko catch an Earthly cold and [[ConversationalTroping discuss]] the concept of powerful aliens having {{Weaksauce Weakness}}es. At the end of the episode, the evil invading aliens are defeated when Nyarko's ringtone, an alien pop song, [[YourHeadAsplode makes their heads explode]] -- a direct ShoutOut to ''Film/MarsAttacks'', which Nyarko explicitly referenced during that earlier dialog.
** In another episode, the group visits the GreatBigLibraryOfEverything because Nyarko has to return an overdue book, but they get sidetracked when two criminals ransack the place looking for a particular book. Trying to be smart, Mahiro guesses that Nyarko's overdue book is what they were after, but it turns out that this time ''[[NotSoAboveItAll he's]]'' the one responsible, due to a copy of "[[LightNovel/HeavensMemoPad Malign God's Memo Pad]]" he idly picked up during their visit and accidentally pocketed. Nyarko even complains about how unfair it was for him to assume that she's always responsible for these things.
** Also subverted and discussed earlier; one episode introduces a vacuum cleaner, voiced by Creator/NorioWakamoto, apparently just to allow another ShoutOut to ''Series/KamenRiderDouble''. At the end of another episode (which also featured it), both Mahiro and Nyarko remark that they ''thought'' the vacuum would turn out to be one of these, only to be proven wrong.
* In ''LightNovel/LogHorizon'', there is a humorous sequence where Akatsuki is trying to run away from Henrietta (or to be more precise, the dress in Henrietta's hands). '''Trying''' being the operative word, as Henrietta has privileges over the building (specifically, who can interact with doors, use skills, or fight). It ends with Akatsuki in a doll outfit. [[TheChessmaster Shiroe]] uses this precise ability to defeat the Hamelin guild, by banning them from entering the guild building (essentially locking them inside their own guild hall). He simultaneously uses the threat of this same ability to blackmail the major guilds into forming a council in order to bring law to the city.
* ''Manga/BlackButler'' has a couple.
** We never see Undertakerís eyes. It looks like a character quirk, but in both the anime and the manga this is to hide something, although this example only has significant impact on the plot in the manga.
** In the second episode/third chapter, Finny picks up a large stone statue and easily tosses it around in an attempt to crush a mouse. Itís played for comedy, as part of the servants goofy antics. Later on in both the anime and the manga, we learn that Finny has super-strength, and is a formidable opponent in battle.
** Whenever Bard blows up the kitchen, itís played for comedic value. Except when there are two intruders are trapped inside, and we learn that Bard's combat specialty is explosives.
** Vice-Principal Agares being clumsy.
** In the anime's third episode, Grell accidentally makes skull shaped topiary out of EVERY bush in the manor. "His" repeated suicide attempts also count.
* In Episode 15 of ''Literature/TanteiTeamKZJikenNote'', there was a gag Wakatake's police-siren cell phone ringer, as Aya complained Wakatake's being an AttentionWhore even down to things like that. In the next episode, when TheTeam is in a stalemate with the JapaneseDelinquents, Aya asks Kozuka to call Wakatake's cell phone, which breaks the stalemate by freaking out the delinquents.
* Yuki gets a cute mustached teddy bear very early into ''Manga/SchoolLive''. It doesn't become relevant until over thirty chapters in when Rii begins [[ThroughTheEyesOfMadness hallucinating]] it is her younger sister.
* In ''Manga/FairyTail'', the girls are relaxing in a hot spring when they learn that the guys are already there (it's a unisex pool). Lucy and Wendy freak out, but Natsu and Grey point out that they've [[ClothingDamage seen the]] [[ReluctantFanserviceGirl girls naked]] [[RunningGag so many times]] that the novelty has worn off. Later, an enemy has Natsu pinned down and is using his {{Invisibility}} magic to [[PowerPerversionPotential make Lucy's clothes disappear]] in order to embarrass Natsu. This completely backfires since Natsu isn't the least bit embarrassed, but the enemy mage ''is''.
* You would think Elena's botched magical surgery on Taizou would be just one of the many gags that pepper ''Manga/TheVoynichHotel''. As it turns out, having your heart on the wrong side of your body is exactly the kind of thing that would win you a few more minutes by confusing your would-be killers, [[BigDamnHeroes allowing help to arrive just in the nick of time]].

* Very very common in long stand-up comedy routines.
** Michael [=MacIntyre=] is particularly notorious for referencing topics he covered earlier in new situations.
** Creator/EddieIzzard does this frequently.
** Baddiel & Skinner Unplanned often incorporated this trope, when earlier topics of discussion would be incorporated impromptu into the current topic, almost certainly as a big punchline.
** Creator/RossNoble is very fond of bringing back jokes he told over half an hour earlier.
** Creator/GeorgeCarlin did this on occasion. In a '70s set, he had a run-through of TV shows, including a ''Series/TruthOrConsequences''-like game show where they were going to reunite a woman with her sister, "but you blew the question, so we sent your sister back to Maine!" Later, a ''Series/QueenForADay''-like game show had the sister on, complaining about a show out west promising to reunite her with her sister, "but that never worked out".

[[folder:Comic Books]]
* An issue of ''ComicBook/{{Prez|2015}}'' has a running gag about a gratuitously-elaborate vending machine that can produce any cut of meat from any animal in its DNA database -- you too can have a mammoth steak in seconds! At the end of the issue, the ambassador suffers heart failure, and with no compatible donor hearts available things are looking grim until Beth has the idea of plugging the ambassador's medical records into the meat machine and ordering a raw heart with the ambassador's DNA.

[[folder:Fan Works]]
* As noted on BrickJoke, AbridgedSeries in general and ''WebVideo/DragonBallZAbridged'' in particular love this.
* ''Fanfic/CalvinAndHobbesTheSeries'':
** At one point, Calvin uses the MTM to contain some lightning in an attempt to stop a storm from doing any further damage. He later uses it for revenge on Socrates.
** Also, the lady with the clipboard recording anything related to Dr. Brainstorm in "Robot's Day Out."
* Surprisingly PlayedForDrama in the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfiction ''Fanfic/ItsADangerousBusinessGoingOutYourDoor''. At the beginning of the journey, Pinkie makes some off-hoof jokes at the kind of monsters that Applejack, Rarity, and Rainbow Dash might run into. When they finally reach the end of their quest, one of those monsters Pinkie mentioned, the World Serpent, is their final challenge. After a description that makes said creature about as big as an island nation, Pinkie is given lip service in one of the biggest OhCrap jokes ever.
* ''Fanfic/TheStalkingZukoSeries'' has Iroh having [[NakedPeopleAreFunny Naked]] [[WebVideo/AvatarTheAbridgedSeries Iroh Time]] in his apartment, [[BrainBleach scarring]] Jet and Zuko's neighbors. Jet realizes that "Mushi" must be the Fire Nation spy instead of Lee since the apartment is poorly insulated and it's early spring, too cold for a non-Firebender to walk comfortably naked.
* In Chapters 1-5 of ''[[FanFic/IAgainstIMeAgainstYou I Against I, Me Against You]]'', Church tries to pass Twilight off as his seeing eye dog to get past an armed checkpoint. When questioned how a seeing eye dog is supposed to help the supposedly blind Church aim, they then try to demonstrate by having Twilight "bark" when Church gets closer to his target. When they face Wyoming in 1-7, they use the same tactic to help Church overcome his [[ImperialStormtrooperMarksmanshipAcademy poor aiming skills]].
* Relatively early in ''[[ Xendra]]'', [[Series/BuffyTheVampireSlayer Xander]] learns of the magical "Law of Precedent" where the more times a spell has succeeded, the more likely it is to succeed in the future. And a spell is more likely to have a specific result if said result has been achieved before. At first, it's just the reason Xander can be changed into a teenaged Xena again after Halloween. But while trying to get the Box Of Gavrok out of Sunnydale to destroy it, some of the Mayor's magical protections are set off and mixed up by the anti-magic protections on Wesley's car. As a result, both Xander and Wesley are turned into women instead of incinerated.
* In ''[[ Zero Interface]]'' the empathic familiar bond between [[Manga/RanmaOneHalf Ranma]] and [[LightNovel/TheFamiliarOfZero Louise]] is shown to work both ways when Ranma's interest in Kirche causes Louise to start lusting after her as well. When Ranma is nearly killed by Wardes, Louise reacts on instinct the next time she sees Wardes and blasts him off the airship they're on.
* {{Creator/madsthenerdygirl}}'s ''Fanfic/MCURewrites'': In [[ the rewrite]] of ''Film/AvengersAgeOfUltron'', [[ComicBook/BlackWidow Natasha]] is asked if she wants to try and lift [[OnlyTheChosenMayWield Mjölnir]] and she replies "That's not a question I need answered" like in the movie. In the FinalBattle against Ultron, she lifts Mjölnir and she, along with the ComicBook/ScarletWitch, decimate Ultron. When her teammates see her holding Mjölnir she replies, [[CallBack "I told you it wasn't a question I needed answering."]]
* In ''Fanfic/PokemonResetBloodlines'', Ash's Snivy gets hit by Aerial Ace in just about every battle she takes part in. She gets so fed up with it, she decides to learn it herself and start hitting others with it.

[[folder:Films -- Animation]]
* In ''WesternAnimation/KungFuPanda'', a joke is made about Po being so fat and fuzzy, that he cannot properly be given acupuncture. This turns into a sort of unlearned ChekhovsSkill later on, when Po ends up facing the most dangerous martial artist in the land... who uses pressure-point attacks, which are useless!
* "Not so fireproof on the inside, are you?" from ''WesternAnimation/HowToTrainYourDragon'' is introduced as a one-off gag. At the climax of the movie Hiccup uses this knowledge to take out the BigBad.
* ''Anime/SonicTheHedgehogTheMovie''. During the last fight scene, Robotnik fires two missiles at Tails' plane. One of the missiles is shaped like a rabbit, and very fast; the other is shaped like a turtle, and ridiculously slow. Robotnik laments that the latter is "another design failure". After the fight is completely over, there's a brief shot of the turtle continuing, slowly and steadily, across the field of battle. Then, as Robotnik gloats to the heroes that he still has the data to build another, stronger Metal Sonic, the turtle missile ''very slowly'' flies up to Robotnik, grabs the data disc from his hand, and explodes.
* ''WesternAnimation/ToyStory'' includes the claw-game worshiping Little Green Men, who hold "the claaaaaaaw" in high regard because it will choose and deliver them to a better place. Fast forward to ''WesternAnimation/ToyStory3'', near the end when the entire group is holding hands as they await their inevitable death in an incinerator... only to look up as see a gigantic crane claw scoop them up being controlled by the Little Green Men adopted by the Potato Heads in WesternAnimation/ToyStory2.
* ''WesternAnimation/{{Up}}'': "Squirrel!" Russell uses it to distract the dogs in biplanes shooting at him, causing them to crash into each other.
* Early in ''WesternAnimation/TheIronGiant'', Hogarth is trying to take a photo of the Giant, but gets bored while waiting for the Giant to appear. During a TimePassesMontage, one of the clips shown is a quick gag in which Hogarth cleaning the lens of his camera only to accidentally take a picture of himself. Later, Mansley discovers the camera and develops the photo that Hogarth accidentally took of himself, revealing the Giant looking over Hogarth's shoulder, thus finally giving Mansley photographic evidence that the Giant exists.
* During the Dazzlings' VillainSong in ''WesternAnimation/MyLittlePonyEquestriaGirlsRainbowRocks'', DJ Pon-3 can be seen [[FunnyBackgroundEvent in the background, bobbing her head to her own music and apparently oblivious to the goings-on]]. It turns out she's unaffected by the HatePlague being spread by the Dazzlings, and later in the movie she helps free the Rainbooms from a trap, and even provides a sound system for the climactic battle.
* In ''Disney/WreckItRalph'', when Ralph is in King Candy's palace, he comments that it's [[PinkIsFeminine oddly pink for a male character]]. King Candy insists that it's clearly ''salmon''. There's a reason it's so pink and so non-fitting to King Candy- he's a usurper who hijacked the game after causing his own to crash due to his [[AttentionWhore desire for the spotlight]]. The castle's original owner was Princess Vanellope Von Schweetz.
* Early on during ''WesternAnimation/{{Storks}}'', the fact that birds can't see glass is used to humorously establish that Junior's boss is a BadBoss. Later on the film, he gets chased by wolves through a glass factory and has to rely on Tulip to make it through, smacking into every other glass pane on the way.
* At the start of ''WesternAnimation/{{Megamind}}'', the solar-powered DeathRay can't fire right away because it's [[{{Irony}} warming up]]. At the climax of the film, [[spoiler: the gun used to de-power Titan]] won't fire right away because it's warming up.
--> '''Megamind:''' Oh, {{you have got to be kidding me}}! [[MisplacedRetribution Minion]], [[IfWeSurviveThis if I live]], ''[[IllKillYou I will kill you]]!''

[[folder:Films -- Live-Action]]
* The crazy guy in the bushes of ''Film/HaroldAndKumarGoToWhiteCastle'' compliments Kumar's "manscaping", which was mentioned near the beginning of the movie.
* ''Film/MontyPythonAndTheHolyGrail'':
** The ending is this. We get a gag of a knight on horseback killing the Famous Historian, and then at the end the police investigating the historian's murder show up and arrest King Arthur. The investigation is shown between scenes several times during the movie. It's why Lancelot isn't in the end scene.
** The end credits are also an example -- there aren't any, since the credits people were all fired for the moose-related nonsense in the ''opening'' credits.
** Also, the bit with King Arthur getting to cross the Bridge of Death by responding to the question about the air speed velocity of an unladen swallow with a question of his own, directly from the first scene of the film. In a blink-and-you'll-miss-it moment, Bedivere ties a coconut to a swallow and releases it in his first scene. It puts a new light on his comment after Arthur's Bridge of Death questions.
** Upon meeting the French, they say they already have a Holy Grail, then at the end they are in the castle with the Grail in it.
** At the end of the Bring Out Your Dead bit, someone comments that Arthur must be a king because he hasn't got shit all over him. The French at the end dump shit on him. Twice.
* In ''Film/HomeAlone'', it's established that Kevin's cousin Fuller is a notorious bed-wetter, and thus, no one wants to share a bed with him. Toward the end of ''Home Alone 2'', Kevin and most of the other [=McCallisters=] (besides Kevin's parents, who have a separate room) are seen sleeping squashed together everywhere other than the bed. Guess who's got that huge bed all to himself (with Coke cans all over it, no less)?
* ''Film/InBruges'' has this dialogue in the middle of the film. Guess whose [[YourHeadASplode head is blown off]] by the end of the film? Jimmy, the midget actor, of course.
-->'''Ray:''' This is exactly my point! People going around calling you a midget when you want to be called a dwarf. Of course you're going to blow your head off.
* ''Film/ShaunOfTheDead'' is chock full of them. Lines that were funny earlier on become rather morose and depressing later. For instance, the quote "You've got red on you" was said to Shaun very early in the movie as a result of him having a red pen in his pocket that had leaked onto the rest of his shirt. Later, it was said about the blood that had been splattered all over him.
* In ''Film/TuckerAndDaleVsEvil'', Chad is revealed to have asthma, using his inhaler many times throughout the movie. During the climax Dale throws a box of chamomile tea at Chad, which causes him to have an asthma attack and fall to his apparent death.
* Made into a form of art in ''Film/HotFuzz''. Everything that wasn't a joke comes back as a joke. Every joke comes back as a funnier joke.
* The one funny moment in the new ''Series/{{Bewitched}}'' movie: An actor attributes his last film's failure to the costume department. This is presented as a spoiled actor making excuses and then forgotten about until an hour later, when he's watching TV and the film comes on, showing him in a snowstorm wearing an enormous fur hat and yelling, "TURN BAAACK!". It was worth seeing the rest of the movie for that.
* ''Film/ShutterIsland'' has a brief gag when the two main characters enter Shutter Island - after being ordered to surrender their guns, US Marshall Teddy Daniels quickly takes his revolver out of his holster, but his partner Chuck struggles to get it out. After several seconds of Chuck struggling, he eventually gets...the entire holster off. On second viewings of the film, it becomes clear that Chuck can't get it out because he's not really a US Marshal.
* For a series with a lot of {{Continuity Nod}}s and {{Brick Joke}}s, ''Franchise/BackToTheFuture'' does not have a lot of {{Call Back}}s that are necessarily this. However, they do have an example in the [[Film/BackToTheFuture first movie]] with the joke about Uncle Joey not making parole in 1985. Then we see him as a baby in 1955 and his mother says that he cries whenever they take him out of his crib.
-->'''Marty:''' "Better get used to those bars, kid."
* ''Film/RockAndRollHighSchool'' loves this trope.
** While the heroine skips school for three days to stand in line for [[Music/TheRamones Ramones]] tickets, her best friend delivers fake notes to the principal to excuse her absence. The first says the heroine's father died, the second says her mother died, and third says [[ArsonMurderAndJaywalking her goldfish died]]. Later, the principal calls the heroine in with proof that the notes were fake; the goldfish, alive and well! Later we see the principal's two idiot assistants eat the goldfish.
** In another example from the same movie, the principal subjects a mouse to rock music of increasing intensity. When she subjects it to the music of Music/TheRamones the mouse explodes. Later, at a Ramones concert, a mouse tries to get in. The bouncer refuses, saying it might explode, until the mouse shows it brought a headset to protect itself.
* In the climax of the Creator/SeltzerAndFriedberg movie ''Vampires Suck'', [[Literature/{{Twilight}} Bella]]... er... [[ParodyNames Becca]] rushes to stop Edward from ending it all, fighting through a crowd of Edward and [[FanPreferredCouple Jacob]] fangirls along the way. At the end, after Becca becomes a vampire, one of the Jacob fangirls kills Edward. This results in a KarmicDeath, as Becca feasts on the fangirl's blood.
* In ''Film/GalaxyQuest'' the whole "By Grabthar's Hammer..." speech is played as such a horribly tired cliche that "Alexander Dane" boils over every time it's said to him. Then it's turned around into one of the most moving moments of the whole film. Ditto for the "Chant of Strength" which appears to help in another scene.
* The RunningGag in ''Film/AlmostHeroes'' where Hunt (Chris Farley) kept getting attacked by an eagle. It happens again in the climax but he hangs onto the eagle until it carries him to the Pacific ocean, beating Lewis & Clark in the process.
* In ''Film/SpiceWorld'' the girls joke about Emma's smile helping her get away with anything, complete with ImagineSpot of her using the smile to get away with murder. Then when the girls are confronted by the police for their wild bus ride across London, all Emma does is apologise and smile sweetly and the girls are free to go inside the concert hall.
* ''Franchise/MarvelCinematicUniverse'':
** In ''Film/IronMan1'', Tony has one of his bumbling armature robots on fire duty during his building of the Iron Man Mk2 suit. His first disastrous flight into the ceiling results in the 'bot dousing him with the extinguisher. During his second, more successful flight, he threatens to donate the bot to a community college if it douses him again. The third time, after his [[EpicFail spectacular botched landing on the roof of his house]], the 'bot douses him again and Tony just lays his head down on the CoolCar he landed on in his basement garage. In a rather funny ChekhovsGun at the end of the film, Tony needs to get at the replacement arc reactor on the table, but is too weak to stand up. Just as he gives up, the robot arm obligingly pushes it into his outstretched hand.
** ''Film/CaptainAmericaTheFirstAvenger'' : When introducing Captain America's new gear, Howard Stark says "Although, HYDRA's not gonna attack you with a pocket knife." When Captain America boards Red Skull's doomsday ship, the first mook to attack pulls out a pocket knife.
** In ''Film/{{The Avengers|2012}}'', the gag with SHIELD agent Phil Coulson attempting to have [[ComicBook/CaptainAmerica Captain Steve Rogers]] sign his mint-condition Captain America trading cards takes on a slight darker turn later on when we see the aforementioned trading cards wet with the (apparently) deceased Coulson's blood, and being used by Nick Fury to motivate the Avengers to get their act together.
** In ''Film/AvengersAgeOfUltron'', in what seems to be a throwaway scene, the Avengers try to lift Thor's hammer at their celebratory party, with none of them succeeding because "they're all not worthy". As Vision tries to convince them of his good intentions, he casually picks up the hammer and hands it to Thor. The Avengers promptly agree to follow. He uses it briefly in the final battle as well.
* Early on in ''Film/RobotAndFrank'', the robot is being teased by children while Frank's in the library without him. The robot repeatedly tells the children not to molest him. When Frank sees this, he tells the robot to scare them off next time by saying "Initiate self destruct" and counting down from 10. When the cops are checking his home at the end and are about to use the robot to bust Frank for grand theft, the robot starts telling the people not to molest them... then says "Initiate self destruct" and starts counting down. It helps Frank escape and later format the robot's memory to help him get away from any charges.
* In ''Film/TheKingsSpeech'', when Lionel tries get Albert to bring up a topic, the latter responds: "Waiting for me to...commence a conversation, one can wait rather a long wait." Later, when Albert returns to apologize to Lionel, he tells him: "Waiting for a king to apologize, one can wait a long wait."
* The [[VengefulVendingMachine extra-powerful soda machine]] in ''Film/SilentMovie'' seems like just another slapstick gag, but later the main trio are being chased by E&D's cronies, and they end up near the same soda machine. HilarityEnsues again, this time as the trio ''weaponize it''.
* In ''[[Film/SiebenZwerge 7 Zwerge]]'', the dwarves' hats [[SomethingElseAlsoRises all stand up straight]] upon seeing Snow White except for Brumboss's hat, which remains limp. Initially it seems like just another throwaway gag, but it also foreshadows that Brumboss is Snow White's father.
* In ''Film/KingsmanTheSecretService'', Eggsy's kindness to animals tends to have unintended consequences. His short-lived high-speed car chase ends because [[PetTheDog he swerves to avoid hitting a fox]]. He fails the final Kingsman test because he refuses to ShootTheDog he raised.
* ''Film/{{Idiocracy}}'': Officer Collins develops an OddFriendship with Rita's pimp, which he accidentally reveals [[EmbarrassingSlide several pictures of himself partying with the guy]] during his presentation on the hibernation project to several army officers. It results in Collins going to jail for running his own prostitution ring, and the project being shut down, leaving Joe and Rita to spend 500 years in suspended animation.
* In the 2000 sequel to the ''Film/TheNuttyProfessor'', [[SuperpoweredEvilSide Buddy]] regenerates after a dog is exposed to his remains which Sherman extracted from his body. This causes him to act like a dog at random moments [[note]]crapping on a newspaper, angrily chasing a cat[[/note]]. Sherman exploits when he needs to reabsorb Buddy, by tempting him with a rubber ball laced with his serum, knowing Buddy would catch it in his mouth.
* In the 2005 ''Film/ThePinkPanther'', Clouseau develops a love for hamburgers and can't pronounce the word properly. At the airport, he tries to sneak a bunch of burgers onto the plane, but a police dog smells them, and the police arrest him thinking he has a weapon on him, since he can't tell them otherwise.

* Five books later in ''Literature/TheHeroesOfOlympus'' series, Annabeth proclaiming the Laistrygonian giants to be "Canadians" in ''Sea of Monsters'' is brought back up in ''Son of Neptune'' where Percy calls them Canadians... in front of genuine Canadian Frank Zhang. Frank is not pleased.
** In another Frank-related moment, Frank trying to figure out Chinese handcuffs in ''The Mark of Athena'' seems like another joke at Frank's expense, with him never having seen them before (and being a little annoyed at the name, as he's part-Chinese)--but Annabeth ends up using the design of the toy to trap Arachne.
* Book #6 of the ''Literature/CaptainUnderpants'' series has George and Harold introducing a new joke called Squishies, which consists of putting ketchup packets under toilet seats so that they squirt onto the legs of whoever sits on the toilet. The next book has Captain Underpants use this with crates of oranges and a giant novelty toilet as a method of defeating the [[VillainOfTheWeek Villains of the Book]].
* ''Literature/{{Discworld}}'':
** Pratchett frequently has a ditzy or naive character relay some kind of aphormism or cliche--for example, the bard telling Cohen the Barbarian about the Gordian Knot, or Magrat explaining how some martial artists can walk on coals without getting burnt, only to have the older, more world-wise listener scoff and pick apart all the logical holes in it. And ''then,'' during the climax, the world-wise character is confronted with a situation that requires them to dive right into the aphormism. Upon which they will give their younger companion some sort of nod of acknowledgement.
--> "Bit of a ''knotty'' one. You'll remember I said that, lad?"
** ''Discworld/WitchesAbroad''. "Glod". And in that same book, Granny Weatherwax's absolute certainty of who she is and where she stands, and tendency to refuse to follow stories which attempt to include her in their plots is frequently discussed in side remarks after seeing it put into action, the first example being her inability to understand Magrat's attempt to "relate to herself" at a conceptual level, gradually building up the reader's knowledge of this aspect of her character. Surprise, surprise, that certainty comes into effect at the end of her book. Both she and her evil sister Lily are trapped separately within a shattered mirror, and Death tells both of them - separately - that they can escape "When you find the [reflection] that's real". Lily, who has lived on stories for most of her life, runs on "through the endless reflections", with the implication that she will never escape. Granny asks if this is a trick question, then looks down at herself. "This one".
* Happens fairly often in the ''Literature/HarryPotter'' books, understandable considering the sheer size of its ChekhovsArmory. Four plot devices in particular are first introduced as gags; the Vanishing Cabinet gets this treatment twice, first trashed by Nearly Headless Nick to get Harry out of trouble with Filch in ''[[Literature/HarryPotterAndTheChamberOfSecrets Chamber of Secrets]]'', then used as a joke by Fred and George in ''[[Literature/HarryPotterAndTheOrderOfThePhoenix Order of the Phoenix]]'' when they shove Montague into it; the latter incident is mentioned directly when the Cabinet becomes a serious plot device in ''[[Literature/HarryPotterAndTheHalfBloodPrince Half-Blood Prince]].'' Hermione signing up for every class in ''[[Literature/HarryPotterAndTheChamberOfSecrets Chamber Of Secrets]]'' is also treated as a character joke, until it's revealed in ''[[Literature/HarryPotterAndThePrisonerOfAzkaban Prisoner of Azkaban]]'' that Hermione's had to use a Time-Turner to get to all her classes, which is then used to save Sirius and Buckbeak. Weasley's Wizarding Wheezes are introduced in a humorous way in ''[[Literature/HarryPotterAndTheGobletOfFire Goblet of Fire]]'', but many of them play a larger role than expected in later books, particularly those used by the trio in their attempt to infiltrate the corrupted Ministry of Magic. Finally, The Room of Requirement is indirectly mentioned in an offhand humorous way by Dumbledore in ''[[Literature/HarryPotterAndTheGobletOfFire Goblet Of Fire]]''; in the final three books, it becomes the most important room in all of Hogwarts.
** Harry was bequeathed the golden snitch he caught in his first Quidditch game in ''[[Literature/HarryPotterAndThePhilosophersStone The Philosopher's Stone]]''. It is well know that the golden snitch can be used to hide small items inside it and can only be opened by the touch of the person that first held it in the game. When Harry is made to pick it up by Scrimgeour, who is trying to gain information from the protagonists in ''[[Literature/HarryPotterAndTheDeathlyHallows The Deathly Hallows]]'', he barely hesitates and glaringly shows nothing happens. Once Scrimgeour left, he explains to Ron and Hermione why it didn't work. When he first caught the snitch, it was humorously shown that they won because he had accidentally caught it in his mouth. Which is the touch the snitch needed to open.
* ''Literature/TheHitchhikersGuideToTheGalaxy1'' opens with a monologue describing all the troubles and widespread unhappiness on Earth, and how one London woman suddenly had an epiphany about how all of that could be solved that was tragically cut short by the destruction of Earth. It then goes on to note "This is not her story" and rambles a bit about the titular Hitchhiker's Guide. ''Literature/SoLongAndThanksForAllTheFish'' opens with a word-for-word repeat of that exact same monologue, but instead ends with the line "This is her story."
* In the first chapter of ''Literature/GoodOmens'', it's mentioned that Crowley made changes to the plans for the M25 to make it a demonic sigil. This sets up his character (he likes to do large amounts of low-grade evil), and once the apocalypse comes it turns into a rather nasty barrier, that completely destroys his car as he crosses it.
* In the sixth ''Literature/SkulduggeryPleasant'' book, the titular character concludes an interrogation of a minor villain by punching him in the face and knocking him unconscious, briefly shocking his apprentice Valkyrie. Because of this, Valkyrie suggests they make a code for "I'm about to punch him", to which Skulduggery suggests "The sparrow flies south for winter". Valkyrie is adamant that it's too hard to slip into a conversation, proven when Skulduggery blurts it out in the middle of the sentence while undercover shortly later. Despite this, the quote is used multiple times in the next few books, despite frequently being admitted to being silly.
* In the ''Literature/TheDresdenFiles'' book Blood Rites, one of the characters constantly gets Harry's name wrong. Later in the book where it turns out that since she either is not smart enough to remember or just does not care, when the time comes for his name to be vital (in framing him for a murder) she gave the police the wrong name. Harry finds this appropriately hilarious and sad.
* At ''Literature/AroundTheWorldInEightyDays'' there are multiple references to Passepartout's watch falling further behind as they travel east, and how the proud Frenchman refuses to touch the heritage of his ancestors. An explanation in Chapter 11 regarding how the days are shorter when one travels eastbound foreshadows TheReveal.
* ''Literature/TheTwits'': Turns out the Shrinks [[DeathByIrony is a real disease]] you can get from being upside-down for too long.
* ''Literature/AMurderIsAnnounced'' by ''Creator/AgathaChristie'': As everyone files into Little Paddocks, each arriving party remarks on the exact same trivial things -- the roses and the fact that the central heating is on -- to humorous effect, as noted by Julia. It turns out that the fact that the central heating is on so early in the autumn season is a vital clue -- it meant that the murderer had intentionally left the fireplace off, ensuring that there would be no light when the power went out.
* In ''Literature/{{Relativity}}'', Sara and Greg have just gotten married when they bump into Sara's old flame, Martin Bling. When Bling finds out Greg is a chef, he mentions that he may want to visit his restaurant one day. Sara mutters under her breath, "Maybe you'll get food poisoning." Ten stories later (and over a year, in-universe), Bling does go to Greg's restaurant... and gets poisoned. His lawyers dig up the security footage of Sara and hire lip-readers to figure out what she said. Oops.

[[folder:Live-Action TV]]
* ''Series/{{Friends}}'' is full of minor examples of these, but there have been a few very significant ones. In season 5, Chandler goes away to Jersey for the weekend claiming it's for a work convention. Monica goes away to Jersey the same weekend claiming it's for a culinary fair. Afterwards, Chandler told Joey he saw Donald Trump while waiting for a lift and Joey also fields a call from Chandler's hotel regarding a forgotten eyelash curler. These appear to be nothing more than normal jokes about Joey knowing obscure trivia or thinking Chandler's gay. However, at the end of the episode, Joey overhears Monica telling Phoebe she saw Donald Trump while waiting for a lift and asking Rachel if she can borrow an eyelash curler because she's lost her own. Joey therefore becomes the first Friend to uncover the truth about Chandler and Monica's SecretRelationship, setting him up for a mini story arc whereby he learns the hard way that KeepingSecretsSucks.
* ''Series/DoctorWho'':
** The episode ''[[Recap/DoctorWhoS33E1AsylumOfTheDaleks Asylum of the Daleks]]'' has the Doctor and his companions trying to rescue a woman, Oswin Oswald, who survived having her spaceship crash into a planet used as an asylum by Daleks. When asked over the radio what she's been doing while trapped on the planet, she responds "Making soufflés". After hearing this, the Doctor asks twice where she gets the milk from to make them, but he doesn't get an answer because someone else insists it's not important. It's played out as an amusing case of SkewedPriorities, but when he sees Oswin face to face the Doctor finds out that Oswin was actually turned into one of the insane Daleks long ago, and that she imagined making souffles and still being human because she couldn't handle the truth.
** The ChristmasEpisode ''[[Recap/DoctorWho2012CSTheSnowmen The Snowmen]]'' has a hilarious scene where the Doctor, having no interest in investigating the snowmen appearing over England, chooses to erase the memory of Clara Oswald who witnessed his encounter with them. The Doctor sends BattleButler Strax to fetch "the memory worm" - one touch of its skin and you lose an hour's worth of memories. The problem is, when Strax returns he's empty-handed and has no memory of the last hour. Strax's failure to retrieve the worm leads to Clara not even trying to run because she finds it more amusing to watch him lose his memory a second time. The Doctor ends up using the worm's bite to remove all of the memories from this episode's BigBad.
* ''Series/PowerRangersRPM'' has two shining examples:
** An early episode has Dillon try to ditch training, while Dr. K tells him he has to learn to be ready for anything. To drive the point home, when he opens the fridge to get a drink, she has a ludicrously over-sized laser cannon emerge. Later on, a comedic AllYourBaseAreBelongToUs fight has broken out, and to deliver the finishing blow Dillon pops open the fridge...
** Another episode includes a flurry of LampshadeHanging, including questioning why the TransformationSequence is punctuated by [[StuffBlowingUp explosions]]. Flynn's morpher then develops a glitch, and he has an idea of how to fix it, but there's the risk of a side effect - namely, an even ''bigger'' explosion. Which he helpfully aims at TheDragon and her {{Mooks}}.
* In ''Series/TokumeiSentaiGobusters'', Beet J. Stag's habit of Jumping in front of Jin in the manner to upstage him comes in handy in Mission 25 when The MonsterOfTheWeek tries to use his candlelight to give Jin Nightmares just as he had to Hiromu, Youko, and Ryuuji when they looked into it. Since Buddyroids are immune to it J is unaffected and Jin is able to slash the wick and put the flame out. Though it's entirely possible that Avatars are immune too as Jin is not really there.
* ''Series/KamenRiderDrive'' has a cop, Lt. Otta, who always hilariously screws up the name "Roidmude," the robots who serve as the series' villains, and for the longest time was skeptical about their existence despite all the evidence. Eventually, we find out that [[spoiler: the Secretary of Defense is a Roidmude with the ability to alter memories and takes great pains to ensure that PoliceAreUseless. Otta learned something important, and Secretary Makage had to erase it. His ArbitrarySkepticism is the spell reasserting itself every time it's triggered by the word "Roidmude," burying anything he knows about them so deep he can't even say the name right. Once cured, he can say it just fine, and remembers what he'd learned before.]]
* In ''Series/{{Angel}}'' one episode mentions Fred laughing at something a Shrub said. Later in the last season when she becomes Illyria one of her powers is talking to plants.
** Also involving Fred is one early episode for her, where she's built some odd looking contraption involving an axe. Multiple character speculate that it looks like "it is either a decapitation device or (knowing Fred) it makes toast". Come the climax of the episode, she actually busts it out and does, in fact, decapitate a demon with it by launching the axe across the room using a foot pedal.
-->Fred (on why she built it): "I was just thinking about what if, like, you arms got cut off and you needed to fight. It would be pretty hard to do... or to make toast for that matter"
* ''Series/ItsAlwaysSunnyInPhiladelphia'', in the episode "The Waitress is Getting Married." At the beginning of the episode, we see Charlie trapping a nest of live hornets in a box, [[CloudCuckoolander thinking they'll make honey for him]]. Charlie then spends the episode dealing with the discovery that the girl he's obsessed with is engaged. In the final scene, he takes a wedding gift to her fiancée. On discovering that he only proposed as part of a cruel prank on the girl, Charlie tells him to keep the gift anyway. As he walks away, we see that the box is the one with the hornet's nest in it.
* One episode of ''Series/FatherTed'' ("Hell") starts with the village idiot entrusted with an anticulated tanker to deliver "Craggy Island's largest ever consignment of raw sewage" for processing. "This button opens the door, this one releases the sewage." This is not mentioned again until the very end of the episode, where he stops to pick up Ted and Dougal. Guess what happens.
* ''Series/TheYoungOnes'' was fond of this. In the episode "Bambi," a CutawayGag visits the old idea that we are all microbes being observed by a giant scientist. Later, after the chaos begins to erupt, the episode ends with a giant-sized eclair falling on the main characters, after the giant scientist left his snack a bit too close to his research.
* In the episode "Everybody Hates the Buddy System." of ''Series/EverybodyHatesChris'', Julius gives Drew a Wayne "Gritzky" jersey. Then in the episode "Everybody Hates Gretzky," a couple of white guys try to steal Drew's jersey, but back off when they realize it's misspelled.
* Frequently occurs on ''Series/JonathanCreek'', where a seemingly completed comic scenario returns following the solution of the [[MonsterOfTheWeek episode's mystery]] to deal the final (hilarious) blow. For example in one episode, Carla is doing a book signing and there is a comic scenario involving a fan's (fully grown) nephew crushing her lap whilst posing for a photo. This is pretty funny in it's own right, but much later on Jonathan discovers that the fan and nephew had really tricked Carla into signing a consent form for her likeness to be used on a range of sex merchandise.
* ''Series/HowIMetYourMother'' does this from time to time such as in Life Among the Gorillas where Marshall's coworkers repeatedly come up with bizarre celebrity comparisons (where the point seems to involve who you'd rather sleep with) while asking, "What do you do? Go!" Its reframed in the last moment of the episode when Robin calls Ted to invite him over and Narrator Ted asks, "What do you do? Go!"
* ''Series/HomeImprovement'' was rather fond of these:
** In the episode "Quest for Fire", the ColdOpen shows Tim Taylor trying to use rocket fuel to light a barbecue grill. This results in Tim [[ launching the grill into low orbit]], in a gag that's seemingly unrelated to the rest of the episode. Later, the Taylors are on vacation at a lake, and [[ at the end of the episode]], right before the ending credits, Tim and Jill are walking away from the lake when the barbecue grill splashes down.
** "'Twas the Flight Before Christmas" has several jokes early on about Tim using {{Absurdly Bright Light}}s to decorate his house for Christmas, including Al saying "You could light up an airport runway with that much wattage!" Towards the end, Tim's trying to make it back home in time for Christmas, but his flight has to be diverted because visibility is too low in Detroit to land any planes. Tim comments that his kids are probably lighting up the decorations as he speaks...then suddenly a beam of light coming from his house lights everything up and makes it possible to land the plane.
* In one episode of ''Series/BoyMeetsWorld'', [[ItMakesSenseInContext Shawn stops Cory from giving Topanga flowers]] by snatching them from him and handing them to a jock who happens to walk by in the school hallway. It's a brief gag that isn't given much attention. Then, several scenes later, Cory and Shawn are alone in a classroom doing ComicRolePlay that involves Cory saying "I love you" to Shawn. They look up and see that same jock standing in the doorway holding the flowers and watching them, then throwing the flowers on the floor and walking away in anger.
* A third season episode of ''Series/ThirdRockFromTheSun'' has Dick and Mary engaging in an ever-escalating prank war, where Dick has Mary's desk removed, sends her a fake letter from then-president UsefulNotes/BillClinton, and gets a garage to add massive speakers and flame decals to her Volvo. In response, Mary gets Dick's hands (and face) stuck to his desk with thermal bond epoxy. While Dick is slowly, and painfully, removed, they finally come to a truce. Mere seconds afterward, they hear a loud, booming noise from outside.
-->'''Judith:''' Mary, it appears your Volvo is back from the shop.
* ''Series/MrYoung'':
** In one episode of this Canadian teen sitcom, Tater says he asked someone if they'd seen a Fryers chicken head, then pulls out a poultry chart and says he thought he meant a medium-sized frier chicken, as opposed to the slightly larger grosser and the slightly smaller boiler. in a later episode, Adam says his mom's "giant man eating chicken" scam doesn't seem very believable, since "chickens are not carnivores, and according to this poultry chart, even a grosser doesn't weigh more than 7 pounds". It turns out to actually be a ''giant man'' eating chicken.
** In the same episode with the "giant man eating chicken", Adam tries to knock over a stack of milk cans, but he's not strong enough, even though he keeps hitting them. Later, Adam goes on a slingshot, and when he lands he hits the milk cans with his head, yet he ''[[EpicFail still]]'' [[EpicFail fails to knock them over.]]
** In the pilot, Adam says Slabb looks like Bigfoot. Later, when he goes into disguise as a cranky old man, he refers to Slabb as Sasquatch.
* In ''Series/TheLegendOfDickAndDom'' episode "Hairwolf", a lunatic goes on a random tirade about things you shouldn't do, like playing the bassoon in the bathtub. At the end of the episode, he jumps in front of the camera and says to the audience, "DON'T have a cheesy ending-noone would believe it".
* In the ''Series/MarriedWithChildren'' episode "The Stepford Peg", while Al and the kids discuss the schedule Al planned out for Peg, Kelly brings up the upstairs bathroom that Peg had cleaned, claiming that there's a window above the sink and she saw a girl who looks exactly like her. This seems like a typical DumbBlonde joke, but then TheTag shows up, in which Kelly walks up to Bud and introduces him to the girl next door. Cue a second Kelly walking in. Bud is speechless.
* In ''Series/{{Spaced}}'', the characters are out boozing when Mike stands up, announces he is going to point the pink pistol at the porcelain firing range, and leaves. We assume that he's taking a trip to the loo. While he's gone, evil Matrix-style Agents turn up to take Daisy, but Mike returns to save the day, wielding a pink handgun.
* Special mention goes to ''Series/{{Supernatural}}'', which had Sam and Dean joking about the existence of unicorns way back in season 2, with Dean sarcastically commenting that "There's a ton of lore om unicorns, too. In fact, I hear they ride on silver moonbeams and shoot rainbows out of their ass!". Five years later, a case revolves around strange deaths in a town including, sure enough, a man being murdered by a rainbow-farting unicorn.
* One episode of ''Series/TheHoneymooners'', entitled [[GameShow "The $99,000 Answer"]] involves this trope. Ralph is cramming for an appearance on the titular game show where he has to identify songs, and Norton is helping him by playing songs on the piano. To Ralph's consternation, EVERY SINGLE song is preceded by Norton "warming up" which consists of the first few notes of "Way Down Upon the Swanee River" followed by [[MinskyPickup "dadum, dadum dum DUM!"]] But after studying almost every popular song in existence, guess what the first song he gets on "The $99,000 Answer" is? And guess who it is that composed that song?
-->'''Ralph:''' ...Ed Norton?
* In the ''Series/AgentsOfSHIELD'' episode "Eye-Spy", Ward mentions to Coulson that Skye has a habit of saying "Bang!" and is having trouble telling a gun's safety from the magazine release. Later in the episode, Skye tries to take down the villain of the week with the [[TranquillizerDart night-night gun]]...and promptly ejects the magazine instead.
-->'''Skye:''' Bang?
* In ''Series/QueerAsFolk'', Stuart teases Vince about his incessant babbling about ''Series/DoctorWho'', joking that soon Vince's boyfriend Cameron would be able to name all of the Doctors in order - leading to a nice little joke where they talk about their FanonDiscontinuity for the show. However, Vince's eventual ultimatum to Cameron is to challenge him to "name all of the actors who played Doctor Who". Cameron can name Jon Pertwee, Tom Baker, "that bloke with the white hair" and "the vet". Vince decides that they're breaking up.
* Several ''Series/MysteryScienceTheater3000'' episodes (usually during the Joel era) end with a host segment showing the Mads still feeling the effects of their Invention Exchange. For example:
** "Eegah" has Dr. Forrester remove TV's Frank's blood and replace it with radiator fluid for the Invention Exchange. At the end of the episode, Dr. Forrester has to give Frank a tune-up because the coolant ran out.
** "Manhunt In Space" has Dr. Forrester and TV's Frank show off bean bag chair pants (pants with a bean bag chair built in). They test them out and promptly fall onto their backs. At the end of the episode, Joel contacts them and finds they're still lying on their backs.
** "Time of the Apes" has the Mads create the Miracle-Grow Baby which starts as an infant and grows up very quickly. At the end of the episode, we see the baby has grown to adulthood. While Forrester and Frank argue over who's going to change the baby and who's going to push the button, the baby says "I'll push the button" and does so.
* ''Series/BuffyTheVampireSlayer''. In "Gingerbread", Willow is boasting of her witchcraft, then admits she can only float pencils. Later she and Buffy are about to be [[BurnTheWitch burnt at the stake]] so Willow tries to frighten the mob by threatening them with her BlackMagic, causing Buffy to mutter, "What are you gonna do, float a pencil at them?" Later on in the season Willow does exactly that, staking a vampire that has her cornered in a supply room with a magically-levitated pencil.
** In "Triangle", [[OurVampiresAreDifferent Spike]] and [[BadassNormal Xander]] run into each other at [[LocalHangout the Bronze]] and Spike raves about a fried onion dish prepared to look like a flower, which Xander mocks. Later in the same episode, a [[AllTrollsAreDifferent troll]] breaks into the Bronze demanding food and mead, and Spike offers him the flowery onion. Two seasons later, Spike is on a mission with [[LovableNerd Andrew]] and they connect over their love of the flowery onion dish that is served at the Bronze. After which he [[LetUsNeverSpeakOfThisAgain threatens to kill him if he tells anyone about the conversation]].

* In most music videos of the Gorillaz "Plastic Beach" album, there is a jellyfish in it, and that jellyfish is usually destroyed somehow. Later in the album, there is an entire song based around jellyfish, ironically trying to get them not killed.
* Music/FiveIronFrenzy did this on their farewell album, with a full song referring to earlier albums' short nonsense tracks (all the "These are Not My Pants" tracks, "Combat Chuck", "Kitty Doggy", etc.) and full-song hilarities ("Where is Micah?", "The Untimely Death of Brad"), named "That's How The Story Ends".

[[folder:Puppet Shows]]
* In ''Film/TheMuppetMovie'', Kermit and Fozzie bring the Electric Mayhem up to speed on the plot by [[NoFourthWall giving them a copy of the script]]. Later, after their car breaks down and leaves them (and their new friends Gonzo, Rowlf, and Miss Piggy) stranded in the desert, the Electric Mayhem are able to find them and help because they read it in the script.
* ''Film/MuppetTreasureIsland'': at one point, Gonzo mentions that his pants are filled with starfish. ("You and your hobbies!" Rizzo remarks). Later on, during the big fight against the pirates, Gonzo whips out said starfish to use as ''shuriken''!
* In ''Film/TheMuppets'', Fozzie suggests that since Miss Piggy's office in France is too far to drive to, they instead travel by map. Later, when Mary and Gary provide backstage help during ''The Muppet Telethon'', the Muppets ask where they came from, so Mary replies, "We traveled by map. We thought it'd be quicker."

[[folder:Video Games]]
* At 3:10 in [[ this]] ''VideoGame/DissidiaFinalFantasy'' video, it's mentioned that Jecht can accidentally kill himself during the "hop back" part of Triumphant Grasp. At 4:17, he does this with [[ColonyDrop Sephiroth's Meteor]].
* Early on in ''VideoGame/{{Fallout 3}}'', local bully Butch is incensed when his [[IneptAptitudeTest G.O.A.T. exam results]] tell him he's best suited to work as a hairdresser. Later in the game, you find out he's resigned himself to being Vault 101's hairdresser, though he [[LessEmbarrassingTerm insists on being called a barber]].
* In the first level of ''VideoGame/EarthwormJim'', Jim must launch a cow into the air in order to make progress. Over the course of the game, the cow will occasionally pass by in the background. Finally, after beating the final boss, Jim meets Princess What's-Her-Name and witnesses the cow come crashing down upon her.
* In one of your early conversations with Samantha Traynor in ''VideoGame/MassEffect3'', she makes a comment about her toothbrush, which uses focused mass effect fields to clean teeth. In the ''Citadel'' DLC, the toothbrush proves instrumental in opening an emergency hatch so that Shephard can break into the Normandy after it gets hijacked.
-->'''Shepard:''' If you'd told me this morning that a toothbrush was going to save the Normandy, I'd have been very skeptical.
* At least half the comedic dialogue exchanges in ''VideoGame/GhostTrick'', whether it's meeting the hyper-friendly Pomeranian, Missile, or discovering how ridiculously severe your LaserGuidedAmnesia is.
* Ashtarte in ''[[VideoGame/TearsToTiara2 Tears to Tiara 2]]'' arguing with Kleito over worshipers, usually Hamil. Then it's revealed that the lack of worshipers had caused the rest of the Ba'al gods to fall into a coma, and she is trying to wake them up. She succeeds and in the climax they save her life.
* Near the start of ''VideoGame/{{Shantae}} and the Pirate's Curse'', Bolo unintentionally traps the residents of Sequin Land Palace inside when he's hired to work around the palace and accidentally installs the door lock backwards, upside down, and inside out. Near the end of the game, Bolo saves Sequin Land Palace by unintentionally causing the Palace Disruptor Cannon to miss when he's hired to work on the Targeting Module, and accidentally installs the main circuit panel backwards, upside down, and inside out.
* The horse armor in ''VideoGame/DLCQuest'' is a reference to the infamous horse armor DLC for ''VideoGame/TheElderScrollsIVOblivion''; buying it has no in-game effect. Except you need it to complete the game; your horse tries to rescue you in the final battle, and if you didn't buy the armor, the final boss will kill it and you in a single hit.

[[folder:Visual Novels]]
* The ''Franchise/AceAttorney'' series often introduces vital evidence as jokes at first. A few examples:
** Polly the parrot in [[VisualNovel/PhoenixWrightAceAttorney the first game]]. A RunningGag in the boatman's house... until they deliver a WhamLine. Much later, the parrot [[MakeTheDogTestify is called to the stand at the trial]], and ''everything'' they've been trained to say turns out to have major significance to the case. Yes, even their ''name''.
** From the third game, Prosecutor Godot's visor making him unable to see red on a white background is originally introduced as a joke at the beginning of Case 3 when he fails to notice a comically large "bloodstain" (actually just ketchup) and gets pissed off that he wasn't told about it earlier (because everyone else assumed it was impossible for anyone to miss). The gun goes off near the end of Case 5, when after the real location of the murder is discovered, you notice that the killer had removed some snow from the area to hide the blood. However, instead of just getting rid of the snow with blood on it, they dug out a large, perfectly square shape. Almost like they didn't know exactly where the blood was and wanted to make sure they got it all...
** Trucy's Magic Panties in ''{{VisualNovel/Apollo Justice|Ace Attorney}}''. A joke at first, becoming a ChekhovsBoomerang later.
** ''VideoGame/AceAttorneyInvestigations'':
*** Calisto Yew's lauging fits. Much later Shih-na laughs in the exact same way, finally proving that Shih-na ''is'' Calisto Yew.
*** Larry Butz's Samurai Dogs. One of the boxes has a bloodstain from when the murderer was injured, and ends up being one of the final pieces of evidence against them.
* ''VisualNovel/NoThankYou'': In the first chapter, the sótano staff tries to get Haru to suggest a name for them to call him by, only for Haru to come up with things like Corn-on-the-Cob, Bean Daifuku, and Pools. Those things are the only happy memories that Haru can recall from his life before arriving at sótano.

[[folder:Web Comics]]
* [[ The 2012 New Year]] comic on ''Webcomic/CyanideAndHappiness'' is one to their 2010 New Year strip, [[ seen here]]
* ''Webcomic/SluggyFreelance'': [[ Emergency Pants]] and [[ Emergency Pants strike back]].
* ''Webcomic/EightBitTheater'' had an issue of Nintendo Power, first appearing in the [[ seventh]] comic. ("Four white mages? It'll never work.") Reappearing in[[ 1221]], when four white mages defeat Chaos, over ''1000'' comics and almost a ''decade'' later, which is probably ''the'' longest set-up in webcomic history (or perhaps ''any'' history).
** There's also [[ this]] strip, where Black Belt unwittingly predicts who history remembers in terms of the heroes. The fact that he was referring to the Light Warriors makes it all the more ironic.
** And then there's Thief [[MonumentalTheft stealing his class change from the future]], which comes back to bite him later.
* In ''Webcomic/GirlGenius'' when Tarvek [[ relates all the trouble Gil got him into while they were in Paris]], there is a very short gag (just one panel, the fifth) in which he complains about having to deal with pirates because of what Gil did. The pirate in that panel looks a lot like Bangladesh [=DuPree=]. It takes [[ two years and five months]] to start to guess what exactly Tarvek went through then.
-->'''Bang:''' (''with glee'') It's Prince "How Dare You"!!
** Which then becomes part of another Chekhov's Gag! When gleefully meeting Tarvek, she curiously asks, if he still has "those little scars" as an offhand comment. Chapters later when Tarvek is taking a bath after [[spoiler:having been stuck in the time bubble for 2 and a half years]], those little scars she "worked so hard on" are the first things she wants to see.
* In ''Webcomic/MenageA3'', several throw-away gags come back for those who pay attention to it:
** Jung's review of Dillon's play.
** Kiley reading a pamphlet about breast enlargement when she first meets Yuki, after her ACupAngst when she saw [=DiDi=].
* Webcomic/{{Shortpacked}} had an arc that was caused by a ChekhovsGunman and a list from a one-shot joke.
* From ''[[WebComic/TheAdventuresOfDrMcNinja Dr. McNinja]]'': "[[ I think I'll have that thing]] [[ stalk Doc forever now."]]
* [[ The derailing of a speech]] in ''Webcomic/DarthsAndDroids'' is brought back [[ almost 500 episodes later]] to denote [[Franchise/StarWars Anakin's fall to the Dark Side]].
* ''Webcomic/{{Goblins}}'' [[ made a joke about]] [[ExactlyWhatItSaysOnTheTin Minmax]] knowing 38 ways to kill a guy with his thumbs, [[{{Munchkin}} but not being able to dress himself]]. Years, passed, the joke was forgotten about... and then [[ this happened.]]
* Early in ''Webcomic/{{Adventurers}}'', Gildward the bard tries to convince Karn into letting him join the party by talking about his backstory, including seemingly-ridiculous things like being a princess and pulling the harp "Muscalibur" from a stone. Turns out the "Muscalibur" thing is real, and [[EvilCounterpart another bard]] resents Gildward for it...
* In one of the earlier strips of ''Webcomic/ElGoonishShive'', [[ Tedd yells "Aaaa! My eyes! My beautiful eyes!"]], but we later [[ discover that he really does have beautiful eyes]]. Beautiful enough that he looks feminine without his glasses.
** The last two panels of [[ this comic]], about a Noodle Incident with a griffin seemed like a throwaway gag up until [[ her wife showed up]].
* ''WebComic/{{Homestuck}}'':
** One RunningGag has a character expecting shaving cream to put out fire, only to learn it actually makes it worse. This is largely inconsequential until the end of Act 5; the Courtyard Droll attaches explosives to a pack of shaving cream and uses it to kill Jade right as she was supposed to save the Kids from being wiped from reality.
** John's hatred of Betty Crocker is based on his distaste for cake; little does he know she's an alien bent on taking over the Earth and re-creating her homeworld.
** Biscuits useless oven turns out to be actually very useful, just not for timetraveling. It actually turns out to function as a sort of portable, oven-sized HammerSpace.
** A RunningGag is that "if you believe hard enough in something it might become slightly less fake". With Jake English, it turns out this is ''literally'' true for him as a Page of Hope. Then in Act 6 Act 6, Jake gets to use his Page of Hope powers to make his view of Dirk, his former boyfriend, become real, by believing in his existence hard enough. This image of Dirk attacks a villain long enough for another hero, Roxy, to escape to another world before the villains destroy most of the planet.
* In ''Webcomic/TheOrderOfTheStick'', Vaarsuvius frequently uses Explosive Runes to play pranks on people V doesn't like (mostly [[HeroicComedicSociopath Belkar]] and [[KnightTemplar Miko]]. (Explosive Runes places words on an object that explode when read.) Come strip 659, V formulates a plan to throw [[BigBad Xykon's]] [[SoulJar phylactery]] into a rift. Xykon attempts to retrieve the phylactery, but [[NiceJobFixingItVillain thanks to one of Xykon's earlier lectures]], V is more willing to use spells that do not directly strike at the enemy, and thus enchanted the phylactery with Explosive Runes. The explosion almost throws the phylactery into the rift anyway.
** While recapturing an old fortress, Xykon pretends to make a HeelFaceTurn, only to transform an angelic warrior into a zombie and rave about how he'd [[ never thought of using flying zombies before.]] A few hundred strips later, Xykon rides a zombie dragon into battle; Roy [[ climbs onto the dragon and decapitates it]], but this doesn't accomplish much because it's a telepathically-controlled zombie. Roy ends up dying because Xykon doesn't even need the dragon to fly, so he just blasts Roy and the dragon corpse out of the sky.

[[folder:Web Original]]
* In ''Roleplay/DinoAttackRPG'', the idea of a cyborg Mutant T-Rex was first brought up by [[AmusingAlien Laxus]] as a joke while he was riffing ''Dino Cop'' with Andrew, Joike, Pterisa, and Dr. Cyborg before the FinalBattle. In the Final Battle itself, Cyrista's Bane showed up... and nobody was laughing at the joke anymore.
* When LetsPlay/{{Raocow}} played ''VideoGame/AnUntitledStory'' and happened upon a heart container, he let his inner LargeHam com out and yell "I FOUND A '''HEART!!!"''' Several games later, in ''VideoGame/BunnyMustDie'', he came across another heart container and,... [[ well,....]] His reactions to previous hearts in BMD were very subdued and didn't use the metal-voice at all. The way-over-the-top version in the link was probably in response to people in the comments complaining about this.
* From the ''Literature/WhateleyUniverse'': In "Ayla and the Birthday Brawl", known practical joker Jericho is along on the trip. He's blind, but notorious for wearing clothing so horrid that people get nauseous or faint. He dresses nicely for the trip, but everyone teases him about it. Jokes ensue, including him claiming that while his clothes are nice, he's wearing an undershirt of DOOM underneath. Later on, the party is attacked. He takes out two mercenaries in power armor by showing them his undershirt and making them puke in their armor. Chekhov's Gag with emphasis on the gag?
* In one [[Roleplay/GlobalGuardiansPBEMUniverse Global Guardians]] story, heroic [[ShapeShifting shape shifter]] Pseudo is hired as a consultant to a production company making a superhero movie. At one point he uses his powers to duplicate the appearance of Viggo Mortensen (the leading man) as a joke and is immediately mistaken for the actor by his co-stars. The story is shared among Pseudo's teammates and they all have a good laugh. A year later, Pseudo is hired again by the same company as a consultant for the sequel. When Pseudo's teammates visit the set, they immediately step up to Viggo Mortensen and start chatting away, thinking he's Pseudo. HilarityEnsues.
* ''[[InteractiveComic Create.swf Adventures:]] [[Webcomic/TouhouNekokayou Shenanigans in a Magical Forest]]'':
** Respecting the original joke from MS Paint Adventures, almost every character must "retrieve their arms" almost immediately after they are introduced, usually as the first command they recieved. This may seem as if it doesn't qualify, but when you can go almost a 100 slides (which would be over several weeks and broken into small updates) without mention of arms, and then suddenly get hit by one out of the blue, it's safe to say that prior to the revival of the joke, most had forgotten about it.
** There's also Masha's seemingly useless bit of paper. It's only mentioned briefly after her "birth"... and doesn't show up again until the ending. She throws it at Cirno to calm her down.
* Often done by Aaron Karo of ''Ruminations'' fame. He'll often bring up random subjects he thinks about in each issue, then come the last rumination, he ends it off with a clever callback to the previous ones before signing off with [[{{Catchphrase}} "Fuck me"]].
* In the ''KISS Comics #1'' review of ''WebVideo/AtopTheFourthWall'', [[TotallyRadical 90s Kid]] makes a [[BlackComedy pretty tasteless joke]] about unearthing Kurt Cobain's body and propping it up onstage. Much later in the ''Planet of the Symbiotes'' review, this is what helps Linkara clue into the fact that 90s Kid isn't himself. Also, the real Kid would know that Kurt was cremated!
* Early on in {{Literature/Worm}}, it's mentioned that a mad scientist created a portal to an alternate Earth through which they exchange [=DVDs=], but the alternate version of the ''Franchise/StarWars'' prequels were [[TakeThat still pretty disappointing]]. Initially it just seems like a throwaway joke but much later on it turns out to actually be important to the plot.
* In ''WebAnimation/TheGastonTrilogy'': Belle saying "My father is a genie! Heís crazy!" in "Gaston Seeks Satisfaction" seems like a one-off joke but actually affects the continuity of "Gaston's Ultimate Mission to Obtain Some Taco Bell", when Gaston remembers her saying he was a genie because someone referred to "crazy old Maurice". Then Monsieur D'Arque wants to take him to Genies R Us, and at the end he's in a lamp.
* ''[[Roleplay/AsteroidQuest Polokoa Quest]]'' has one that's a little meta. In March of 2015, Jukashi posted [[ this]] ''Franchise/{{Castlevania}}'' parody comic with Rokoa as Dracula and Polo as a Belmont in the quest's discussion thread. It seemed like a one-off gag... until [[ Vampire Rokoa showed up in the quest proper,]] revealing that it was actually {{Foreshadowing}}.
* In a "Beyond Belief" episode of ''Podcast/TheThrillingAdventureHour'', Frank Doyle purchases at auction a literal Chekhov's Gun (as in, a gun belonging to Anton Chekhov, playwright and werewolf hunter). It's turned into a gag by Lampshading the ChekhovsGun rule and then being stored inside Freud's cigar box. In a later episode, Frank brings out the gun (and the silver bullet loaded within) to defeat an entirely different monster, the Calaca.
* In Season 2 of ''WebVideo/DragonballZAbridged'', the following exchange occurs twice with a different ending each time:
-->'''Vegeta:''' ''So what're you doing here?''
-->'''Gohan:''' ''Oh, you know, just... flying around.''
-->'''Vegeta:''' ''Flying around?''
-->'''Gohan:''' ''Flying around.''
-->'''Vegeta:''' ''Thwarting my plans?''
-->'''Gohan:''' ''Thwarting your plans?''
-->'''Vegeta:''' ''Are you?''
-->'''Take 1 [[labelnote:*]]Shortly before Vegeta discovers Gohan has stolen his Dragonball.[[/labelnote]]:'''
-->'''Gohan:''' ''No.''
-->'''Vegeta:''' ''Good, 'cause that'd be bad.''
-->'''Gohan:''' ''How bad?''
-->'''Vegeta:''' ''I'd have to kill you.''
-->'''Gohan:''' ''That's bad.''
-->'''Vegeta:''' ''Indeed.''
-->'''Take 2 [[labelnote:*]]When Gohan and Krillan have summoned the dragon and are about to steal Vegeta's wish[[/labelnote]]:'''
-->'''Gohan:''' ''...Yes.''
-->'''Vegeta:''' ''({{Beat}}) I'M GONNA F*CKING KILL YOU!''
* In the web video [[ That's Offensive]], the three poker players constantly say things that offend each other, each time getting offended over more trivial things. At one point, a player simply opens his mouth to speak, and immediately has the other two players yell that he is being offensive - because it's 7:02 pm, which is when they're supposed to have a minute of silence for their friend Schmitty, who died at 7:02 of unknown causes. At the end of the video, the poker players get so offended by each other that they all pull out guns, when suddenly the ghost of Schmitty appears to stop them, informs them all that he himself died in a situation similar to the one they are currently in, and reminds them all that they can't expect everyone to know what will offend them.

[[folder:Western Animation]]
* ''WesternAnimation/TheSimpsons'':
** In a season 6 episode, "Itchy & Scratchy Land", the family, heading to the title theme park, makes a brief stop at "Five Corners", in which five different states intersect. 15 seasons later, Sideshow Bob takes Bart to the same area in "The Bob Next Door" to exploit extraterritorial jurisdiction, setting the stage for the episode's climax.
** In the season 2 episode "Bart the Daredevil" Bart wants to attempt to jump Springfield Gorge on his skateboard. Homer stops him at the last moment and prepares to do it himself to scare Bart straight. Homer accidentally attempts the jump and ends up falling down the gorge. After being loaded into an ambulance, the ambulance immediately crashes into a tree and Homer goes down the gorge ''again''. Over ten years later in TheMovie, the climax has Bart and Homer (unintentionally) make a successful jump of Springfield Gorge on Homer's motorcycle. The two pause for a moment of realization and then cheer. Also, the busted-up ambulance is ''still there''.
** In "Funeral for a Fiend", Sideshow Bob "dies" and we see that his coffin has a high bump at the end of it to make room for his large feet. This jokes later becomes important to the plot; Lisa figures out that something is up when she wonders why Bob's family would pay extra for a custom-made coffin to comfort a dead guy.
* ''WesternAnimation/FamilyGuy'' loves these.
** One memorable example is when Peter, at the beginning of the episode, notes that he saw a Discovery Channel documentary on Fire Trucks, which then segues into a short and nonsensical fake documentary of Fire Trucks, which has them hunting gazelle in the savanna. It's funny, it's over, and out of mind... until, in the final scene, a Fire Truck suddenly attacks Peter on his lawn.
** Another gag had Franchise/SpiderMan saving random characters ("Everybody gets one."), that had whole seasons in between the gags.
** Peter is trying to get a promotion at the beginning of the episode. So to impress his boss, he tells her he planted explosives on the competition's bill-board. He directs her to the window, where the bill-board is on a building beside a children's hospital. When he pulls the trigger, the hospital blows up, and he makes a point about how he screwed up. Near the end of the episode, after a series of wild antics, he ends up in the boss' office again, and asks if he ever ended up getting the promotion. She makes a big point about how he blew up a hospital, and the episode ends with him in court.
--->"[[LampshadeHanging You think everyone just FORGOT about that?!]] [[RealityEnsues There were fingerprints; forensic reports! 19 people died, Peter.]] ''[[OhCrap And the FBI knows it was you...]]''"
** In the first ''Franchise/StarWars'' ParodyEpisode, the scene where Chris Griffin/[[UniversalAdaptorCast Luke Skywalker]] watches the sunset has a LeftTheBackgroundMusicOn joke with Music/JohnWilliams and the London Philharmonic. They are later seen as some of the casualties of the Empire's attack on Luke's farm.
* ''WesternAnimation/WileECoyoteAndTheRoadrunner'' cartoons used this occasionally.
** One notable example had a steel wall not release properly from a slot in the ground, but when Wile E. Coyote went to check it, it didn't spring up on him right away. Instead, it waited till the end of the cartoon to pop up and stop Wile E. while he was chasing Road Runner.
** There was one where they set up one of his traps, and it goes off on him several times wrong before he gives up. So he goes for something else, in which the original trap went off him, then the combination of his next scheme and the attack was his downfall, then he'd almost get the roadrunner, and the trap would get him again.
** And there's another where he rigged up a "Free Glass of Water" with a match attached to the glass on top of a box containing TNT. Pulling the glass up would cause the match to light the fuse. The Road Runner ignores it and holds up a sign stating that Road Runners can't read and don't drink. Later on, Wile E. is crawling on the ground exhausted after another failed attempt and grabs the rigged glass, only realizing his mistake right before the TNT goes off.
* In the animated special, ''Tales From ComicStrip/TheFarSide I'', there is a 15-second "Meanwhile... back in Egypt" segment that consists of a desert marketplace full of locals who eventually stop and wave at the viewer, saying [[ "Gung Hay Fat Choy!"]], before going about their business. A pretty tame gag by the standards of ''The Far Side''. But in the sequel, there's a segment with amoebas at a party that's abruptly interrupted when their "world" goes sideways. The camera cuts to a man putting down a mostly-empty water glass... then pulls back to him and his family exiting the same exact Egypt scene (sans waving) from the first special.
* ''WesternAnimation/JimmyTwoShoes'':
** The CelebrityIsOverrated episode has Heloise using an inflatable Jimmy doll to distract the press. Several episodes later, we discover that she has several of these dolls in her StalkerShrine.
** In another episode, Heloise asks Jimmy if he swallowed her Bad Luck Accelerometer and he replies "When have I ever done something like that?" followed by a montage of scenes where he accidentally swallows various things, including an elephant. Later, he tries to spit out the Accelerometer and instead spits out the elephant.
** In the same episode, when Heloise first makes the Accelerometer she shows Lucius a tape in which it is used as a whale magnet. At the end of the episode, Jimmy spits out the Accelerometer and throws it at someone who is promptly crushed by a whale.
* There's sort of a cross between this and ChekhovsBoomerang in the first two episodes of ''WesternAnimation/AvatarTheLastAirbender'': After Aang comes out of the iceberg and collapses, Sokka pokes him in the head a few times with the hilt end of his spear. Later, when Zuko attacks the Southern Water Tribe's village, Sokka tries to fight him, but Zuko breaks the spear and pokes ''him'' in the head with its hilt. In the following episode, Sokka returns the favor with Aang's staff. Then, in the third season, Sokka pokes Zuko to get him angry.
* ''WesternAnimation/{{Animaniacs}}'' could really play this trope for all it was worth. 'The Monkey Song' stands out in particular for being a four-minute-long series of Chekhov's Gags, from Squit's flute, to Mindy and Buttons flying around on balloons, Pinky and the Brain running away with the mousetrap, even Slappy vs. the Mime.
* ''WesternAnimation/SouthPark'':
** The show has two in the "Biggest Douche in the Universe" episode. Early on, in a fit of frustration with John Edward, Stan calls him a douche and goes on to say that he nominates him for the Biggest Douche in the universe award. At the end of the episode, some aliens show up to reveal that Stan's nomination apparently got through. Not only that, John Edward ''[[TakeThat wins]]'', much to his dismay. The episode's other example is the series of spoof trailers based on movies starring Rob Schneider. Another one at the very end of the episode reveals that Rob Schneider accidentally got possessed by Kenny.
** In "You're Getting Old", there's a joke where Stan can't tell the difference between a turd in a microwave and an ad for Kevin James's ''Zookeeper''. In the following episode, at the very end, Stan's friends ask him to come watch a movie together. Guess which one it is a sequel of.
--->'''Cartman:''' Zookeeper 2: Zookeepier!
* In the pilot episode of ''WesternAnimation/DrawnTogether'', Captain Hero wishes for a 12-year-old girl and a donkey, and it appears to be a joke about Captain Hero being a pervert. In the second season, it's revealed that he meant Matthew Broderick and Sarah Jessica Parker. This is a rare example of a Chekhov's Gag spanning seasons. An ''actual'' 12-year-old girl riding a donkey also appears to him in a dream once.
* In part 1 of the ''WesternAnimation/{{Bonkers}}'' pilot, Bonkers slips on a banana peel, pointing out to Lucky that no Toon can resist doing that. In part 2, this is used to expose the Collector as a human.
* ''WesternAnimation/{{Futurama}}'': Near the start of the episode "Put Your Head On My Shoulder", there's a scene where Bender goes in for a checkup, and is warned that his ass might explode at any time. He rejects the option of getting shock absorbers for it and the matter is apparently forgotten as the episode's main plots of Amy and Fry's relationship (and aftermath) and Bender's attempt at being a paid matchmaker take over. Then at the very end of the episode Fry [[LiteralAssKicking accidentally kicks Bender's ass]], which promptly explodes.
* The 1979 Nelvana short ''Intergalactic Thanksgiving'' featured one amusing gag. On the planet Laugh-A-Lot, where humor was the norm, King Gucci was attempting to perform the planet's biggest PieInTheFace gag on a waiting courtier. The ceiling opened to reveal the huge pie, but it wouldn't drop. Fast forward about halfway through the short, when his oracle basically tells him his humor (and thus his throne) was being upstaged by a family of ''boring space farmers'', he pulls the cord one more time in frustration. You start to hear the sound of something falling. The King then runs into the courtier...still standing there waiting for the punchline. Gucci looks up... Cue giant SPLAT!
-->'''Oracle:''' Now ''thaaaat's'' FUNNY!
* ''WesternAnimation/PhineasAndFerb'':
** In the episode "Doof Side of the Moon", Doofenshmirtz accidentally reveals a jelly-bean taped to a cork instead of his big new invention, and claims in embarrassment "Don't judge it, it's a layered idea!" Later in the cartoon, Perry is unable to stop the Lunar Rotate-inator from being activated when he trips over the jelly-bean and cork. Doofenshmirtz proceeds to brag "I ''told'' you it was a layered idea!"
** In "Phineas and Ferb and the Temple of Juatchadooin", Phineas tries to figure out how to get a key out from under a glass dome, when Isabella points out "Or, we could hit it with a rock!" Later, Isabella tries to figure out how to deactivate the amulet that controls the rampaging Corn Colossus, and Phineas says "Or, we could hit it with a rock!"
* In an episode of ''WesternAnimation/TheFairlyOddParents'', Crocker makes fun of Timmy for believing 2+2=5, but as part of a plan by Remy Buxaplenty to make Timmy stop needing Cosmo and Wanda so they would have to leave Timmy, Stephen Hawking bursts in and shows an equation in which Timmy's answer is correct. The episode ends with Crocker chasing Stephen Hawking, shouting "I checked your math, and you're wrong! Two plus two isn't five, it's six! ''Six''!"
* In ''WesternAnimation/TheSmurfsTheLegendOfSmurfyHollow'', the goat that keeps pestering Vanity by eating out of his cornucopia hat becomes the Headless Horseman that Papa Smurf used to save his little Smurfs in Smurfy Hollow from Gargamel.
* ''WesternAnimation/SnoopyComeHome'': "[[RunningGag NO DOGS ALLOWED!]]" When Snoopy goes to live with Lila, more out of duty than anything, he encounters this sign at the apartment she lives at. For once, when the {{Leitmotif}} plays, it's actually ''triumphant'' rather than sinister.
* ''WesternAnimation/GravityFalls'':
** The premiere episode "Tourist Trapped" ends with Mabel getting a grappling hook after Grunkle Stan allows the kids to pick any item of their choosing from the Mystery Shack's gift shop. Nineteen episodes later, in the season finale "Gideon Rises", the grappling hook saves Dipper and Mabel from falling to their deaths after a fight with Gideon.
** In "Legend of the Gobblewonker", Grunkle Stan criticizes the counterfeit money made by Dipper and Mabel, saying "You call that Ben Franklin? He looks like a woman!" Then six episodes later in "Irrational Treasure", Mabel finds a secret historical document proving that Ben secretly ''was'' a woman.
* In the ''WesternAnimation/LittlestPetShop2012'' episode "[[Recap/LittlestPetShop2012S3E12TheVeryLittlestPetShop The Very Littlest Pet Shop]]," there is a throwaway joke in the ColdOpen that Zoe impulsively has to fetch sticks that get thrown within her vicinity. (Makes sense, as Zoe is a dog.) Later in the episode, the shop is shrunk to the size of a dollhouse with everyone still inside except Zoe, and a little girl claims the building as her own. This quirk of Zoe's comes back near the end of the episode, when the girl throws a stick within Zoe's line of sight deliberately to distract her from taking the shrunken building back.
* In the ''WesternAnimation/RockosModernLife'' episode "Fish and Chumps", Rocko and friends go on a fishing trip, and meet a GiantSquid who's obsessed with the cheese-flavored bait they were going to use. When the trip goes awry and they end up lost at sea, they're saved by that same squid.
* ''WesternAnimation/StevenUniverse'':
** In "Monster Reunion", Steven tries to communicate with Centipeedle through writing, but she only writes incomprehensible squiggles, to his dismay. Later, after they've warped to the wreckage of Centy's ship, the other Gems manage to find them. When Steven asks how, they show him a stack of Centy's drawings - and explain that the squiggles are written in the Gem language.
** When Steven talks to Peridot for the first time in season one's "Marble Madness", he lists off the names of some of his friends and family in a quick joke. Over eighty episodes later, in the season four finale "I Am My Mom", this list is used by Homeworld to locate and kidnap said people for Homeworld's PeopleZoo.
* ''WesternAnimation/MiloMurphysLaw'' has a quick joke in the episode "Backward to School Night", where time traveler Cavendish nearly gets run over by a car and his partner Dakota acts oddly indifferent about the near-death incident. A few episodes later, in "The Island of Lost Dakotas", it's revealed why he was so blasé about it: [[spoiler: [[TheyKilledKennyAgain Cavendish dies with such regularity]] that Dakota has created a system where he goes back in time to prevent his partner's constant deaths, then has the prior version of himself go off to live on a deserted island to minimize temporal irregularities.]]