->'''Utahraptor:''' Hey, T-Rex!\\
'''T-Rex:''' Hey! Don't try to trick me!\\
'''Utahraptor:''' Huh? Oh, April Fool's. No, I just wanted some help moving something heavy.\\
'''T-Rex:''' Sorry, I'm busy.\\
'''Utahraptor:''' Oh. ''({{beat}})'' OK.\\
''(Utahraptor leaves)''\\
'''T-Rex:''' April Fool's.
-->-- '''''Webcomic/DinosaurComics'''''

Ah... [[AprilFoolsDay April 1st]]. It is the day where everyone can pull tricks at someone without worry. It is the time of the year where you let yourself loose and have light-hearted fun.

Some works will have plots based on April Fool's Day, much like the ChristmasEpisode. Plots will revolve around characters pranking each other. It might be just a bunch of harmless fun. Very often, however, what was intended as a harmless prank might spiral out of control and create real problems.

If the show as a resident {{Jerkass}} or [[TheBully Bully]], that character might use this celebration to be a douchebag to everyone around them and simply yell ''"April Fools!"'' to be immediately immune from any form of criticism. They use the freedom of the day to be abusive towards others by pulling pranks and get away with it scot free! If that is the case, the episode will probably end with the [[CantGetAwayWithNuthin jerk getting his comeuppance]] ending with ''[[WhosLaughingNow "April Fools!"]]'' being uttered by the former victim as he or she pulls a prank ''on'' the prankster. Of course, there have been variations, with even the prankster getting away with it.

{{Escalating War}}s are not uncommon with these stories.

Note that this is '''NOT''' about episodes that simply aired during April Fool's Day. This is simply about episodes with the story that focuses on April Fools Day, hence this trope's name. While it is possible for them to air during early April, that is not a requirement.

This trope is for Administrivia/InUniverseExamplesOnly. For examples of RealLife April Fools pranks by creators, see AprilFoolsDay.

[[folder:Anime & Manga]]
* The ninth episode of ''Anime/SmilePrettyCure'' had Yayoi attempt to pull an April Fool's prank by saying that she was transferring to a new school. However, she ended up telling this to Miyuki, who promptly panicked and began telling the other girls, with Yayoi being unable to get an word in edgeways, mostly because they kept assuming she was going to talk about them separating. When they ''do'' find out the truth, they aren't happy... until they realize that the whole thing started because Miyuki believed her.
** Bonus points to one copy of the episode having an Akanbe eyecatch on it.
* Part of an episode of ''Manga/LuckyStar'' involves April Fool's lies. Konata briefly tricks Kagami into believing that she finished her homework herself, Kuroi-sensei calls Konata claiming to have overwritten one of Konata's saved games, Konata told Kuroi that Miyuki said teaching must be easy if Kuroi could do it, and Tsukasa told Kagami that she had told someone an April Fool's lie.
* ''LightNovel/HaruhiSuzumiya'' had an April Fool's day episode where Achakura tries and fails to trick Nagato several times.
* ''KeroroGunsou'' has a chapter where the Platoon fools Fuyuki and Natsumi into thinking they have gotten serious about their invasion of Earth - they even hijack some news broadcasts and internet sites to amplify the effect of their supposed attacks on the population. It even includes a number of {{Shout Out}}s to OrsonWelles' radio adaptation of ''Radio/TheWarOfTheWorlds''.
* An arc in ''Anime/LuckyStar'' has a few.
** a phone call between Konata and Kagami has [[BrilliantButLazy Konata]] claiming to have finished her homework by herself, shocking Kagami... until Konata revealed that it was an April Fools' Day lie.
** After the call, Kuroi-sensei called Konata, tricking her into thinking she'd saved over game data:
--> Ms. Kuroi: Sorry, Izumi. I deleted all your saved data.
--> Konata: WHAT?!
--> Ms. Kuroi: Fooled ya, fooled ya, today is April Fools!
--> Konata: She must be so bored calling up this late.
** Then Konata told Kuroi that Miyuki had used [[{{Sensei-chan}} her]] as an example of why being a teacher must be an easy job.
** Meanwhile, when asked, [[CloudcuckooLander Tsukasa]] tries her hand at a ''recursive'' April Fool's lie, confusing Kagami a bit:
-->Tsukasa: What I said just now... I lied... when I said I lied?
* {{Doraemon}} had an April Fool's plot beginning when Nobita uses the excuse of April's Fools to avoid getting beaten up by Giant for tricking him. Giant then asks if he's sure it's April 1st, causing Nobita to doubt if it's actually April 2nd, so Giant gets the right to beat him up. When all said and done, Giant revealed that it's REALLY April 1st so he gets away for bluffing Nobita about the date.
** Another episode started with Giant, Suneo and Shizuka playing April Fool's joke on Nobita. One of the jokes include [[DudeNotFunny ''his house is on fire'']], so he has the right to be panic being the paranoid kid he is. Enraged by his friends fooling him, Nobita pleads to Doraemon for a device that makes its user able to make all April Fool's joke become reality. And since this is Nobita we're talking about, he's going to abuse it for his own good.
** The plot point of the RetCon used by the manga (first story in Volume 7) and the second part of the two-parter anime special to bring Doraemon back. After getting tricked by Gian and Suneo that Doraemon has returned (and a couple more pranks) due to it being the said date, Nobita remembers [[spoiler:that Doraemon has left behind a special box that would grant him one more gadget that should only be used in case of an emergency. The box grants him a potion that would make anything he says become a lie. He quickly uses it to unleash revenge on Gian and Suneo, but then on the way home, muses about the prank Gian and Suneo pulled on him and how Doraemon would never return. Naturally, Doraemon returns at the end of the chapter[=/=]anime.]]

[[folder:Comic Books]]
* The Franchise/{{Batman}} story ''ComicBook/ArkhamAsylumASeriousHouseOnSeriousEarth'' takes place during April Fools' Day. Early in it, SelfDemonstrating/TheJoker tells Batman that he's going to shove a pencil [[EyeScream in a girl's eye]] (which later inspired a Joker in [[Film/TheDarkKnight a different adaptation]]), only to later reveal he was just April fooling Bats and the girl is fine. According to WordOfGod, Two-Face doesn't shoot Batman in the comic's last page despite getting tails from his coin because it was April Fools' Day.
* The Batman series ''Comicbook/TheLongHalloween'' involves a serial killer--nicknamed Holiday--who kills once a month, always on a holiday. Except when April rolls around. Holiday commemorates April Fools Day by not killing anyone that month, but instead cornering The Riddler in an alley and shooting a [[KnifeOutline bullet outline around him]].
* A classic {{Superman}} story from the Silver Age, "The Night of March 31st," ends with Superman going to bed on March 31 only to wake up to utter chaos. Villains who know his secret identity, Lana Lang trying to kill him, Superman flying around the city in Clark's glasses, and so forth. The story asked the readers if they could "guess the solution of the astonishing story that began on the night of March 31st!" (The answer, of course, is not related to what day it is when Superman goes to bed, but what day it is when he wakes up.)

[[folder:Fan Fiction]]
* ''Fanfic/CalvinAndHobbesTheSeries'' has "Let Us Prank the Fool", which involves Calvin trying to prank [[ThePrankster resident prankster]] Socrates before April 1st.
* Subverted in ''FanFic/WhoSilencedEllyPatterson'', April ''thinks'' Brad is trying to pull this on her, but when he confirms he's ''not'' joking, and that her mother Elly ''is'' dead, she screams and faints.

* In the 1939 film ''Film/GoodbyeMrChips'', the boys of Brookfield school play pranks on the masters on April first, and the eponymous Mr. Chipping's wife goes into labour. [[spoiler:Sadly, both Kathie and the baby die.]]
* Featured in the {{Slasher Movie}}s ''Film/AprilFoolsDay'' and ''Film/SlaughterHigh'', plus the lesser known ones ''April Fools'' and ''Killer Party''.
* In ''Film/TheFrenchConnection II'', Popeye arrives in Marseilles on April 1 to find the police gutting a shipment of fish, searching for drugs. It's soon after revealed the anonymous tip about the fish was a prank, much to the narcotics head's frustration.

* In ''[[{{Duumvirate}} Billy and Howard]]'', the twins play jokes on each other. HilarityEnsues, for certain values of hilarity.
* In ''Literature/TheConfidenceMan'', it is April Fools' Day when a mysterious man sneaks onto a steamboat and tests each passenger's confidence through moral questioning while [[ConMan conning them out of their money one by one.]]
* According to WordOfGod, [[Literature/HarryPotter Fred and George Weasley]] were born on April 1st.
* ''Literature/BrownsPineRidgeStories'': This is one of [[ConsummateLiar Jerome's]] favorite holidays as it provides him the opportunity to pull as many pranks as possible, such as saying that the store is on fire... [[SubvertedTrope except]] he's telling the truth this time.

[[folder:Live Action TV]]
* In a first season episode of ''Series/{{Community}}'' the plot is centered around Britta's attempt at an April Fool's Prank, after being called a 'killjoy' one too many times.
* An episode of ''NotGoingOut'' has [[spoiler:Lucy claim she's pregnant in a ruse to get Lee to admit he [[ADateWithRosiePalms masturbated in her bath water]]. She reveals this by declaring "April Fool's!", although [[FridgeLogic the events of the episode appeared to take place over several days]].]]
* A ''Series/{{MASH}}'' episode has the 4077th staff playing April Fools' pranks on each other.
* A ''NewsRadio'' episode has Jimmy James doing this...''in February''.
* In a Season One ''Series/RedDwarf'' episode, Holly tells Lister that an attack fleet from the Norweb Federation is after him for his crimes against humanity -- he left two sausages to go mouldy three million years ago, and they now cover nine tenths of the Earth's surface. They also have a final electricity demand for 180 billion.
-->'''Lister''': A hundred and eighty billion pounds? You're kidding!
-->'''Holly''': ''(suddenly wearing Groucho glasses)'' April fool.
-->'''Lister''': But it's not April!
-->'''Holly''': Yeah, but I could hardly wait six months with a red hot jape like that under me belt, could I?
* ''ThePriceIsRight'' has been renowned for pulling some hilarious April Fools shenanigans.
* The penultimate episode of ''KenanAndKel'' (if you don't count the movies) is this trope, with the titular duo performing many pranks including getting ''the mailman'' to hit Kenan's mom in the face with a pie.
* In ''Series/TheWorstYearOfMyLifeAgain'', the episode "April Fools Day" revolves around the pranks played on and by Alex.
* ''Series/{{Castle}}'' combines this trope with BirthdayEpisode in "The Lives of Others"; Castle's birthday is April 1. [[spoiler: The whole plot, in which [[RearWindowInvestigation Castle is convinced that a tenant in the apartment across the street is a killer]] is an elaborate birthday surprise staged by Beckett.]]
* ''Series/{{Victorious}}'' did one where it proceeded as a normal episode with clearly not normal things happening around the cast.

[[folder:Newspaper Comics]]
* An old ''{{Peanuts}}'' strip has Lucy coming up to Charlie Brown at school recess and telling him the little red-haired girl wants him to come over and eat lunch with her. Charlie Brown nervously walks off, then - after a {{beat}} panel - returns to shoot a DeathGlare at Lucy as she says, "April Fool!"

[[folder:Video Games]]
* Each of the ''VideoGame/AnimalCrossing'' games has some sort of special event on April 1:
** In the original, Tortimer gives you a copy of the fake NES game ''Super Tortimer'' (no, you can't play it).
** In ''Wild World'', you get a letter from your parents with a joke.
** In ''City Folk'', Tortimer gives you a furniture leaf. Not a piece of furniture. Just a leaf.
** April Fools' Day in ''New Leaf'' is ''much'' more involved than April Fools' in the earlier games. The recurring {{NPC}} [[TheBlank Blanca]] appears in your village to pull pranks; she enters the villagers' houses one by one to impersonate them, and you have to guess who is the real villager and who is Blanca in disguise. If you correctly identify Blanca, the real villager will give you their picture, and if you correctly identify every villager, Blanca will send you her picture in the mail.
** Additionally, in all the games, villagers will try to trick you with various lies (with varying degrees of believability).

* [[http://www.qwantz.com/index.php?comic=44 One]] ''Webcomic/DinosaurComics'' strip had T-Rex playing an April Fool's prank on Utahraptor simply by claiming he is busy.

[[folder:Web Original]]
* WebVideo/{{Sillypplproductions2}}: Breez says that since Furno is turning evil, and Nex looks like the better choice to date, and Surge is going to go to school [[note]]haha, no; why they even believed him in the first place is up for debate[[/note]].

[[folder:Western Animation]]
* ''WesternAnimation/FamilyGuy'': In "April in Quahog," the infamous, appalling stunt pulled by Channel 5 newscasters Tom Tucker and Diane Simmons, claiming -- via use of seemingly legitimate news stories -- that the Earth was being sucked into a giant black hole and everyone would be killed.
-->'''Tom Tucker:''' Yes, April Fools. We, at Channel 5 News conducted the whole black hole story as part of our commitment to be festive around the holidays.
-->'''Diane Simmons:''' And with only eighty-seven suicides and widespread looting, we think this was a pretty successful practical joke!
--> '''Brian:''' [[DudeNotFunny You... DICKS!]]
* In an old Paramount-Famous Studio short, ''{{Popeye}}'' had to deal with Bluto abusing him because it was April Fools. He will try to get back at the big guy, but Olive scolds him for not celebrating the day. He of course eats his spinach, but Bluto trades it with a toy snake inside a spinach. However Popeye still managed to win by scaring Bluto with an inflatable toy.
* ''CatDog'' has "Kooky Prank Day", where Cat is on the receiving end of every prank in Nearburg.
* A ''HouseOfMouse'' short involves Mortimer and Mickey out-pranking each other.
* A ''SpongeBobSquarePants'' episode entitled "Fools in April" focuses on [=SpongeBob=] pulling a prank on everyone (who actually enjoyed the pranks) including [[DeadpanSnarker Squidward]], who finds it irritating. He then does a prank to [=SpongeBob=] that [[UpToEleven rather crosses the line]], causing the sponge to flee the Krusty Krab in tears and have everyone think of him as a jerk. [[spoiler:He does apologize to [=SpongeBob=], but it ends up with [=SpongeBob=] joking about getting hurt from the joke]].
* In ''ThePenguinsOfMadagascar'', King Julien learns of April Fools a little too late, so he decides to prank everyone to make up for lost time, even if it's not April 1.
* The final episode of ''TheAngryBeavers'' was going to have Norbert and Daggett realizing that they're cartoon characters, and then they vanish from existence. At the end, Norbert says to Daggett, "There's just something I want to say..." Then Daggett asks, "What?" And Norbert yells, "APRIL FOOLS!!!"
** NOTE: The voiceovers for the final episode were recorded, but the episode never got into the animation stage due to [[ScrewedByTheNetwork Nickelodeon not allowing shows to break the fourth wall]].
* ''WesternAnimation/{{Recess}}'': "The Big Prank" and "The Madness of King Bob" (not set in April Fool's Day, but were often rerun around the time).
* ''WesternAnimation/HeyArnold'' had the aptly named "April Fools Day" episode where Helga and Arnold tried pranking each other...then Arnold took it a little too far. Then Helga used his guilt to fool him even further.
* {{Nicktoons}}:
** ''TheWildThornberrys'' had an episode about April Fools' Day with Eliza and Tyler pulling pranks at each other.
** ''WesternAnimation/TheFairlyOddparents'' had a semi-recurring character called The April Fool who is the personification of April Fools' Day (like The Easter Bunny or Baby New Year for Easter and New Years) and talks like a Jerry Seinfeld stand-up act ("[[CatchPhrase What's up with that?]]").
** In ''WesternAnimation/HeyArnold,'' Arnold finally gets one up on Helga, with plenty of over-the-top flirting on Arnold's part as he does so - probably influenced by the post-movie feelings inferred that Arnold has for Helga starting to surface.
* ''WesternAnimation/TheSimpsons'': the first clip show used April Fools' Day as a framing device. Bart, trying to outprank Homer, puts a can of Duff in a paint shaker. The ensuing explosion of high-pressure beer puts Homer in the hospital, where the family talking about his past experiences triggers the {{Flashback}}s.
--> '''Lou:''' We need pretzels. Repeat, pretzels.
* On ''WesternAnimation/JimmyTwoShoes''' AlternativeCalendar, the holiday is Lucius Fools Day, where Lucius pulls mean-spirited pranks on everyone (as opposed to his usual KickTheDog mentality).
* ''WesternAnimation/{{Beetlejuice}}:'' "Scare And Scare Alike" had Beetlejuice and Lydia playing practical jokes on each other for Scary Fools Day.
* Tex Avery's 1940 [[LooneyTunes Warner Bros.]] cartoon "Holiday Highlights" is a series of vignettes depicting selected holidays. When it gets to April 1st, the picture is completely blank, much to the hilarity of the announcer ("Fooled ya! Fooled ya! There ain't no picture!") and the irritation of the theater management (card slide reads "T'ain't funny, [=McGee=]!")
* ''WesternAnimation/TheSmurfs'' episode "April Smurf's Day" is this trope in action.