[[quoteright:350:[[Manga/{{Saki}} http://static.tvtropes.org/pmwiki/pub/images/saki-pinky.jpg]]]]
[[caption-width-right:350:Now we know they mean '''[[SeriousBusiness business]]'''.]]
->''"Fire, Water, Earth, Air! I declare a pinky-swear!"''
-->-- '''Master Roshi''', ''DragonballZ''

Pinky swears are used as a way to form a pact or as a declaration of friendship between children. While the practice is considered cutesy and juvenile to older persons, children often take this kind of gesture [[SeriousBusiness seriously]], as if their very lives, [[SkewedPriorities or worse,]] ''[[SkewedPriorities friendships]]'', hang in the balance of words spoken over interlocked fingers.

Usually this gesture is accompanied by a rhyme or "oath" spoken in unison by the pinky swearers. This can vary by region.

While North American children tend to use the chant "Cross my heart and hope to die, stick a needle in my eye," Japanese schoolchildren use the following "oath":

''Yubikiri genman, uso tsuitara hari senbon nomasu, yubi kitta'' which colloquially means: "Pinky promise pledge: If you're lying, I'll make you drink a thousand needles. Pinky promised!"

"Yubikiri" means literally "finger cut", likely because of the timeless punishment of cutting off a finger if you fail or break a promise or contract (still practiced today amongst some yakuza and other gangsters), so the last bit of the promise is literally "our fingers have been cut!" to seal the deal. Also, the term ''hari senbon'', while meaning literally "1,000 needles", is also a regional slang term for a pufferfish, which is covered with 'needles' when inflated. So, they could also be promising to make you drink a puffer fish, which obviously would be painful, followed by a rather nasty death by neurotoxin.

Russian children, too, use a similar pinky finger gesture when promising to be friends and no longer fight. The chant for this occasion can be roughly translated to English as the following: "Make peace, make peace, make peace, and don't fight anymore, and if you fight, I'll bite, and biting is not enough, I'll beat you with a brick... we cannot beat with a brick, we are friends now!"

In Australia (and perhaps elsewhere) there is an understanding that if the pinky swear is broken, the one who broke it has their pinky finger broken in turn.

A common variation is for an adult to make a "pinky promise" to a child as reassurance. Either at the child's request or to show that the adult understands how children feel. May end up as a HeroicVow. Commonly subverted into a KickTheDog moment by having the villain use a [[ChildrenAreInnocent child's trust]] in the pinky promise to trick them. Especially cruel villains may even [[EvilGloating mock]] the child for their [[DidYouActuallyBelieve gullibility]] after revealing their true motives. Unless the power of the pinky promise makes him do a HeelFaceTurn.

A cousin to this trope is the RedStringOfFate; which is connected by pinky fingers.

See {{Yubitsume}} for when a character goes through with it and cuts off their finger.

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!!Examples:

[[foldercontrol]]

[[folder: Anime & Manga]]
* ''{{Dragonball}}'' Fire, Water, Earth, Air; I declare a pinky swear!
%%* ''Franchise/SailorMoon''
* ''KareKano'', including in the opening song
** Not only that, the opening song is called "Tenshi no Yubikiri", meaning, "An Angel's Pinky-Promise".
* ''RanmaOneHalf''
* ''LightNovel/MariaSamaGaMiteru''
* ''Manga/KodomoNoOmocha''
* ''Anime/YuGiOh'' (young Jonouchi and Shizuka).
* ''{{Kanon}}''; Yuuichi and Ayu's relationship is marked by several of these. [[spoiler:It even becomes a bit of a FunnyAneurysmMoment at the end of her route.]]
* Hatoko and Misaki in ''KidouTenshiAngelicLayer'' make such a promise, cementing each other as TheOnlyOneAllowedToDefeatYou. [[spoiler:When Sai defeats Hatoko later on, they make another promise, that Misaki will beat Sai.]]
* The teenage girls on the crew in ''SuperDimensionCenturyOrguss'', who are from a parallel universe race with two tentacles in their hair, do this with the tentacles in the first episode, weirding out Kei.
* Also used in the last episode of ''Manga/CardcaptorSakura'', when Sakura and Shaoran vow to keep in touch.
** That's not the only time... It's used in both the anime and the manga multiple times.
* Used straight several times, and later somewhat subverted in ''VisualNovel/SchoolDays''; especially when the promise is actually about something ''very'' important. Of course, [[spoiler:part Makoto being [[{{Jerkass}} Makoto]] and part everyone being [[WhatAnIdiot idiots]], he ended up breaking ''every single one of them''.]]
* Lelouch makes a promise to Nunnally in ''Anime/CodeGeass'' that he will make a better world for her and never lie to her. Tian Zi and Li Xing-ke may have the most epic pinky swear in all of anime, in which Xing-ke promises to [[IOweYouMyLife use his life, which she saved, for the good of her country]] that results in WeddingSmashers, a coup d'etat and some GambitPileUp.
* In ''Anime/MagicalGirlLyricalNanohaStrikerS'', before she leaves for a one-day conference, Nanoha performs one of these with her adopted daughter, Vivio, saying that she will give her some caramel milk if she promises to wait for her return like a good girl. [[spoiler: Unfortunately, [[BigBad Jail]] [[AllYourBaseAreBelongToUs attacks their base]] on that night and takes away [[MysteriousWaif Vivio]]]].
** The two of them makes another pinky swear in ''[[Manga/MagicalGirlLyricalNanohaViVid ViVid]]'', where Nanoha makes Vivio promise not to use her [[OlderAlterEgo Adult Mode]] for mischief. It remains to be seen how long this promise will be held.
** At the end of ''[[Anime/MagicalGirlLyricalNanohaAs A's]]'', when Hayate goes out for a Christmas party, her doctor makes her promise to come back that day after having spent Christmas Eve out of the hospital for the final battle of the season (although her being teleported out wasn't her fault), and they seal it with a pinky swear.
* Shows up near the end of ''[[PrettySammy Magical Project S]]''.
* Hijiri and Kazusa do this in ''YamiNoMatsuei''.
* Kyon did this with the adult Mikuru in ''LightNovel/HaruhiSuzumiya'', [[spoiler: when Kyon and the young Mikuru traveled 3 years back in time.]]
** One of [[UncannyValleyGirl Ryoko]] [[CuteAndPsycho Asakura]][[TheIngenue 's]] [[ImageSong image songs]] is about pinkie promises.
* In ''AxisPowersHetalia'', Germany and Italy's Pact of Steel is forged with a pinky swear.
** Slightly subverted by the fact that both of them are grown men... Although Italy is a bit immature. It was Germany's idea, though; it's stated that he got the idea from Japan.
* ''LoveHina'', Mutsumi and Naru pinky swear in volume seven.
* In ''XxxHoLic'' (anime only), one of Yuuko's customers lands herself into hot water by making promises she can't keep.
** There's also the PinkySwear between Watanuki and Himawari.
* Manatsu practically forces Ichika into one of these near the end of the first episode of ''UtaKata''. It also features prominently in the EndingTheme.
* In ''Manga/{{Saki}}'' this is done between Nodoka and Saki to underline Saki's promise that she won't hold back at [[SeriousBusiness playing mahjong]] anymore.
* Takaaki and Miyako from ''DemashitaPowerpuffGirlsZ'' did a pinky swear when they're little so that they will meet again some other time.
* Happened in ''Anime/MonsterRancher''.
* In ''{{K-On}}!'' a flashback told by Ritsu shows her and Mio doing this when they decided that they would one day form a band. Followed by Mio pointing out that it [[SelfServingMemory didn't happen quite like that]].
* This is done twice between San and Saturn in ''SetoNoHanayome'' (once as kids and once in the present).
* ''UragiriWaBokuNoNamaeWoShitteiru'': Tsukumo and Toko do this in episode 10.
* In ''ThereBeyondTheBeyond'', Futaba attempts this, but CloudCuckoolander Kiara sucks on his pinky, instead.
* In ''Manga/{{Bakuman}}'', [[spoiler:Kazuya Hiramaru]] makes one with [[spoiler:Yuriko "Ko Aoki" Aoki]] that he will get serialized at the next meeting. [[spoiler:Takuro Nakai]] sees this and is quite horrified.
* ''[[Anime/TheIdolmaster THE iDOLM@STER]]'' - The Producer to Yukiho (ep 3) and Miki (ep 12).
* ''Manga/{{Bleach}}'' anime episode 247. While Captain Ukitake is trying to recapture his zanpakuto's spirit Sogyo no Kotowari, he promises them that if they give him their weapons he'll play with them as long as they like. They ask him to pinky swear on his promise and he agrees.
* {{Doraemon}}
[[/folder]]

[[folder: Comic books]]
* {{Deadpool}} short story 'The Pinky Swear'. Being deadpool, he takes it very seriously.
* The playground vow in ''MyLittlePonyFriendshipIsMagicIDW'' is a particularly silly oath:
-->Sunshine, sunshine, ladybugs awake\\
Clap your hooves and bake a cake\\
If I do lie and spill the beans\\
You can make me eat sardines.
[[/folder]]

[[folder:Fan Works]]
* In ''Fanfic/KyonBigDamnHero'', Kyon's sister promises her brother not to tell Haruhi [[spoiler:Tsuruya kissed Kyon]]. While Kyon's sister didn't tell Haruhi, she acknowledged it's her fault Haruhi learned that because she slipped when talking with a cousin.
* ''FanFic/BeyondTomorrow'': Kikyo does one with [[OriginalCharacter Hanyuu]] to reassure her that she is not [[HalfBreedDiscrimination prejudiced against half-demons]] and won't hurt her, even chanting the Japanese pinky rhyme for good measure.
[[/folder]]

[[folder: Film]]
* Used in the live action ''Film/{{Casper}}'' movie between a father and daughter [[spoiler:(it even becomes a ChekhovsGun: when the former dies, his ghost only remembers the daughter after she hooks her pinky with his)]].
* A pinky-swear was the only thing that could show the strength of Chris' vow that he didn't know that a gun he gave Gordy to play with in ''Film/StandByMe'' was loaded in the first place.
* In ''Film/RadioFlyer'', the seriousness of promises in a childhood view is underlined with the final pinky promise between adult Mike and his son.
* WesternAnimation/DespicableMe: Gru makes one of these to [[spoiler:Agnes, promising to come to the girls' ballet recital.]]
* Koda from ''Disney/BrotherBear'' insists that [[JerkWithAHeartOfGold Kenai]] do this so he could take him to the Salmon Run. In the sequel, this became a regular for them whenever they make a promise.
[[/folder]]

[[folder: Live Action Television]]
* Young Antonio's promise to young Jayden in ''Series/PowerRangersSamurai'' to train and fight at his side when the Nighloks returned was sealed with one.
* In the Korean drama ''{{Mawang}}'', a particular pinky-swear becomes a rather sinister plot twist.
[[/folder]]

[[folder: Video Games]]
* ''VideoGame/{{Fallout 2}}'' has a variation on the whole pinky-swearing idea. After being asked for help, the PC can ask a minor NPC to cut off his right pinky in order to "seal the deal," presumably to test if he is serious about his promise or not. The NPC may or may not agree to do it. If he does, a [[KarmaMeter good]] player can stop him before he actually does so, but [[VideoGameCrueltyPotential an evil PC]]...
** ...can then tell him to [[ChaoticEvil fry it up and eat it]]. At that point, the NPC will try to kill you.
* Crops up in ''VideoGame/TalesOfTheAbyss'' with Luke a few times. Demonstrates his child-like understanding of the world, even when he is insisting that he hates them. [[spoiler:Though some of the pinky swears from the past were between Asch and Natalia.]]
* A major motif between Jin and Tsubaki from ''VideoGame/BlazBlue'', to the point that their "love theme", so to say, is called [[http://www.youtube.com/watch?v=Tj99ZyXuNGU "pinky promise"]].
[[/folder]]

[[folder: Web Original]]
* OverheardInNewYork: "She pinky swore she was 18!"
[[/folder]]

[[folder: Webcomics]]
* In ''Li'l Mell'', Mell makes the time-traveling older Sergio pinky swear that they'll be best friends forever, and she seems to expect the younger version to abide by it.
[[/folder]]

[[folder: Western Animation]]
* In ''WesternAnimation/{{WITCH}}'', near the end of the season 1 episode "The Mudslugs", Cornelia and Will reconsile their friendship with a pinky swear.
* One episode of ''WesternAnimation/{{Arthur}}'' had a bunch of the main characters doing this.
* In ''DrawnTogether'', Princess Clara swears two other characters to secrecy with a pinky swear. However, one of them breaks her silence almost instantly (as in, without even leaving the room).
* In ''WesternAnimation/TheVentureBrothers'', when Dr. Girlfriend demands that the Monarch stop being Rusty's nemesis if he wants to marry her, the Monarch pinky-swears on it. When that promise is violated by his henchmen he yells "I made a pinky swear! A SACRED pinky swear!!"
* In the ''WesternAnimation/AmericanDad'' episode ''{{Tearjerker}}'', Stan makes a pinky promise with JohnnyDepp that the latter would tell the former if he became a robot.
* In ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', Pinkie Pie will swear her friends to a "Pinkie Promise," complete with an odd ritual: "Cross my heart and hope to fly, stick a cupcake in my eye."
** Later on [[LampshadeHanging lampshaded]] by Twilight as a pretty odd way of swearing:
-->'''Fluttershy''': You must swear that you don't tell Rarity!
-->'''Twilight Sparkle''': I promise.
-->'''Fluttershy''': Pinkie Pie Swear!
-->'''Twilight Sparkle''': Cross my heart and hope to fly, stick a cupcake in my [[EyeScream AAAAAH!]]
** [[DemonHead And you do]] ''[[DemonHead not]]'' [[DemonHead want to break a Pinkie Promise.]] 'Cause if you do, Pinkie Pie will '''[[LightningBruiser HIJACK]]''' you for sure. This was [[LampShaded lamp shaded]] in the episode "The Last Roundup".
* In ''FishHooks'', in the Halloween special, Oscar would only save Jocktopuss' life if he promises to never steal candy again... but a normal promise wasn't enough.
-->'''Jocktopuss''': Ugh, Jocktopuss hates you.
[[/folder]]
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