History Main / CelebrationMiscalculation

* In ''WesternAnimation/TurningRed'', Mei and her friends celebrate having raised the money for the 4*Town concert thinking it's the next day only to find out a few seconds later it's not.

* ''WebVideo/StampysLovelyWorld'': Fizzy sets up a birthday party for Stampy in his debut Episode 393, "Fizzy Elephant", which was released in March. Stampy's birthday is in December, so he naturally comments on this, but decides to have the party anyway.

* On its first season, ''WebVideo/SouthpawRegionalWrestling'' celebrated its "Lethal Leap Year" event... in 1987. [[FailedASpotCheck A year without a Leap date.]]

--> '''Dartz:''' We awe hewe to cewebwate an event so fantastic that the whole world will wemember for years to come!\\

--> '''Kenan:''' You got the wrong cake and the wrong date!

* ZigZagged in ''Series/ILoveLucy,'' during the "Europe" arc--to make up for being away from Little Ricky on his birthday, Lucy decides to throw a party for a local boy who claims that it's his birthday, too. The boy winds up bringing a whole group of other kids who all claim that it's their birthday; Lucy isn't fooled, but goes along with it. Eventually the first boy feels guilty and admits to lying, and tries to get everyone to give back their presents--one girl says that it really ''is'' her birthday, however, and thus Lucy declares that everyone can keep their gifts.

-->'''The Rock''': ''The Rock's birthday is May 2nd, you stupid son of a [[ThisIsForEmphasisBitch bitch]]!''

--->'''Paul E. Dangerously''': ''It isn't Sting's birthday!''
--->'''Cactus Jack''': ''I know that. Don't you think I know that? But I wasn't here for Sting's last birthday. I wish I was at Sting's last birthday. But you see it's very important that we celebrate now, because Sting's last birthday was Sting's ''[[ImpliedDeathThreat last]]'' birthday! BANG BANG! BANG BANG!''

-->'''Henry''': Hang on tight as we kick off ''[=KaBlam=]'''s fan-tabulous [[CoughSnarkCough *cough24thcough*]] episode extravaganza, here's ''Sniz and Fondue!''

* Enforced in ''WesternAnimation/StarVsTheForcesOfEvil'': Star never celebrates her birthday on the actual date because that's also [[FictionalHoliday Stump Day]]. She thinks celebrating her instead of the Stump is a sacrilege that invites its wrath. [[RealAfterAll And she's more or less right.]]
* {{Invoked}} in the ''WesternAnimation/StevenUniverse'' episode "[[Recap/StevenUniverseS1E13SoManyBirthdays So Many Birthdays]]"--[[KidHero Steven]] finds out the [[ParentalSubstitute Crystal Gems]] don't celebrate birthdays, being [[TheAgeless ageless]], and decides to throw them each a party anyway. They find all of the birthday rituals [[HumansThroughAlienEyes bizarre or downright terrifying]].

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--->'''Cactus Jack''': ''I know that. Don't you think I know that? But I wasn't here for Sting's last birthday. I wish I was at Sting's last birthday. But you see it's very important that we celebrate now, because Sting's last birthday was Sting's ''[[ImpliedDeathThreat last]]'' birthday! [[CatchPhrase BANG BANG! BANG BANG!]]''

* Wrestling/{{WWE}}: In one part of the memorable "This Is Your Life" segment on Raw, [[Wrestling/MickFoley Mankind]] brought a clown to sing "happy birthday" to [[Wrestling/DwayneJohnson The Rock]] as well as bringing out a birthday cake for him. Because he was absolutely unimpressed, this is what he has to say to Mankind:
-->'''The Rock''': "The Rock's birthday is May 2nd, you stupid son of a [[ThisIsForEmphasisBitch bitch]]!"
** Mick Foley must like these. One time in Wrestling/{{WCW}} he (as Cactus Jack) & Wrestling/AbdullahTheButcher brought out a big birthday cake and sang "{{Happy Birthday To You}}" for Wrestling/{{Sting}}, who wasn't there at the time.
--->'''Paul E. Dangerously''': It isn't Sting's birthday!
--->'''Cactus Jack''': I know that. Don't you think I know that? But I wasn't here for Sting's last birthday. I wish I was at Sting's last birthday. But you see it's very important that we celebrate now, because Sting's last birthday was Sting's ''[[ImpliedDeathThreat last]]'' birthday! [[CatchPhrase BANG BANG! BANG BANG!]]

* In ''Anime/FutureGPXCyberFormula SAGA'', Randoll comes to Asuka's apartment to give gifts for her, thinking that it's her birthday. Asuka then tells him that her actual birthday is March 14th. Funnily enough, it's actually ''Randoll's'' birthday (his is on July 7th'').

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* For some reason, Creator/JasonStatham's birthday keeps getting referred to as the 12th of September, even though it's actually in July. He usually politely thanks people for the birthday wishes, but also points out it's not his birthday.

* In the beginning of the ''WesternAnimation/SpongebobSquarepants'' episode "Opposite Day", Spongebob and Patrick are annoying Squidward by throwing a birthday party for him, which really isn't, as the quote from above states it. This is what prompts him to move out of Bikini Bottom, which [[StatusQuoIsGod apparently backfired on him thanks to Spongebob and Patrick]].

* ''Series/{{MASH}}'': In order to brighten the mood of the camp BJ tells everyone it's Hawkeye's birthday and they arrange a {{Surprise Party}} for him. Hawkeye 'accidentally" lets slip that the same day is also BJ's wedding anniversary. Ultimately Hawkeye has to go out on a medical emergency so BJ recruits some miscellaneous extra to say it's his birthday.

->''"It's not my'' '''''BIRTHDAY!!!"'''''
-->-- '''[[WesternAnimation/SpongebobSquarepants Squidward]]''', "Opposite Day"

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* In ''Series/ItsAlwaysSunnyInPhiladelphia'', the gang plans out a surprise birthday for Charlie to make him feel better. But it isn't his birthday. Frank just said that [[spoiler:to trick them into planning a luau party for his own birthday.]]
* ''Series/JustShootMe'': Jack wants to get Maya a present for her thirty-fifth birthday, and decides that, after years of neglecting her as a child, he should give her "the gift of me." This makes Maya angry, because her birthday is 7 months from now, and is upset that her own father wouldn't know. Still, Jack is sure that it's someones birthday... and that's when they both realize that they have forgotten Maya's mother's birthday.
* ''Series/{{MASH}}'': In order to brighten the mood of the camp BJ tells everyone it's Hawkeye's birthday and they arrange a {{Surprise Party}} for him. Hawkeye 'accidentally" lets slip that the same day is also BJ's wedding anniversary. Ultimately Hawkeye has to go out on a medical emergency so BJ recruits some miscellanous extra to say it's his birthday.
* Inverted in the ''Series/{{Seinfeld}}'' episode, "The Outing", where George, Kramer, and Elaine each plan on getting Jerry something special for his birthday; Kramer is the first to give Jerry his present, though Jerry insists it's not his birthday, although the others insist that it is, to which Jerry comments, "Maybe you're right, maybe it is my birthday..."

* Played with in ''WesternAnimation/AliceInWonderland''. Alice comes upon the Mad Hatter, the March Hare, and the Doormouse celebrating what she thinks is a birthday party, but they're celebrating their unbirthday - which is any day that isn't your birthday. Alice realizes it's her unbirthday too and they include her in the celebration.

* For some reason, Creator/JasonStatham's birthday keeps getting referred to as the 12th of September, even though it's actually in July. He usually politely thanks people for the birthday wishes, but also points out it's not his birthday.
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* Played with in ''Disney/AliceInWonderland''. Alice comes upon the Mad Hatter, the March Hare, and the Doormouse celebrating what she thinks is a birthday party, but they're celebrating their unbirthday - which is any day that isn't your birthday. Alice realizes it's her unbirthday too and they include her in the celebration.

* The ''WesternAnimation/ThreeTwoOnePenguins'' episode ''Compassion Crashin'' starts off with the penguins throwing a surprise birthday party for Jason and Michelle, only for Jason to point out that their birthday was two months ago.

* ''WesternAnimation/DastardlyAndMuttleyInTheirFlyingMachines'': In "Happy Bird Day" (the final episode), the Squadron is under the impression it's the General's birthday. At the end, it turns out it's Dastardly's birthday.

* ''WesternAnimation/TheHairBearBunch'': The bears sneak back into the zoo after a night out in town and fake being asleep when the keepers arrive at their cave. Peevly asks Hair where he got the party hat on his head, to which Hair says that they were celebrating Peevly's birthday.
-->'''Peevly:''' My birthday isn't for six months!\\
'''Hair Bear:''' Nothing like getting a head start, sir.
* The ''WesternAnimation/ThreeTwoOnePenguins'' episode ''Compassion Crashin'' starts off with the penguins throwing a surprise birthday party for Jason and Michelle, only for Jason to point out that their birthday was two months ago.

So you happen to have a group of friends who want to do something nice to you. What do they do, you say? They decide to make a birthday party for you in the comfort of your own home. When you come home, they all surprise you and tells you happy birthday. Wait. Why are you not happy?! We worked hard to make this party for you!

Oh, it's not your birthday? Whoops.

This is the trope where characters don't realize that it isn't the character's birthday. This can be played in many ways. Either they forgotten to ask the character when is their birthday, or is because they're just being too kind to the character. This can often be geared towards a grumpy character whom the others want to cheer up.

This is the inverse of ForgottenBirthday. This can combine with ScarySurpriseParty for extra comedy value. Related to IronicBirthday, which is when the character doesn't want to celebrate despite the fact it's their birthday. Compare with BirthdayHater for when it is their birthday, but they don't want to celebrate it anyway.