->'''Alexa''': You're twins.\\
'''Ian''': What? No! Really?\\
'''Jeremy''': Mum should have told us. I feel cheated!\\
'''Ian''': Duped!\\
'''Jeremy''': Hoodwinked!\\
'''Alexa''': They think they're charming.\\
'''Liana''': Rakish.\\
'''Alexa''': Roguish.
-->-- ''WesternAnimation/BarbieAndTheDiamondCastle''

A [[TwinTropes Twin Trope]]. The tendency of twins to [[WittyBanter banter]] with each other. This includes FinishingEachOthersSentences and [[ComedyDuo feeding each other lines]], among other things. A common trait of SingleMindedTwins and [[TwinTelepathy Telepathic Twins]].

This can also be done by ThoseTwoGuys.

TruthInTelevision, especially with twins of the same gender, as sharing one room and being in the same grade means they spend much more time together than average siblings. For that matter, some sets of twins develop a language specific to themselves that no one else understands.
----
!!Examples
[[foldercontrol]]

[[folder: Anime and Manga ]]

* Kaoru and Hikaru in ''Manga/OuranHighSchoolHostClub'' bicker regularly.
* Considering twins make up half the cast, it's only natural this trope pops up a lot in ''{{Futakoi}}''.
* Shion and Mion from ''HigurashiNoNakuKoroNi'', occasionally, but sometimes it [[{{Yandere}} isn't]] for laughs.
* ''LightNovel/{{Bakemonogatari}}'''s NextTimeOn sequences are rapid-fire, seemingly random exchanges between Tsukihi and Karin, the main character's younger sisters.
* [[NationsAsPeople Ame]][[LoveFreak rica]] and [[ShrinkingViolet Canada]] get to do this occasionally in ''AxisPowersHetalia'', when they're alone together and America happens to remember he has a brother. Though there's usually a [[BoisterousBruiser clear winner]] there.
** With a notable exception - that one time Canada made America [[CryCute cry]] by [[TheLongList listing off everything he didn't like about him]].

[[/folder]]

[[folder: Fan Fic ]]

* Ethan and Evan in ''FanFic/{{Dalton}}''

[[/folder]]

[[folder: Literature ]]

* ''Literature/AliceInWonderland'': Tweedledum and Tweedledee.
* Creator/RobertAHeinlein:
** Castor and Pollux Stone from ''Literature/TheRollingStones''
** Laz and Lor in his later novels.
** Subverted in ''Literature/TimeForTheStars''. Tom and Pat Bartlett ''think'' they have a private language that no one else understands, which they refer to as a "prison-yard whisper". They participate in a study of twin communication, which proves that they can't understand audio recordings of the "whisper". It turns out that they're [[TwinTelepathy telepathic]]. And the telepathy is instantaneous and has no range limit. It works over ''interstellar'' distances.
* Fred and George Weasley from ''Literature/HarryPotter''.
* Lori's sons Will and Rob Willis (of the ''[[Literature/AuntDimity Aunt Dimity]]'' series) will bicker a fair amount, sometimes with just a simple one-upmanship, sometimes in a larger succession. Their request to visit Skeaping Manor's museum prompts this exchange:
--> '''Lori:''' Yes, we'll go. If—
--> '''Will:''' We clear the table.
-->'''Rob:''' And load the dishwasher.
--> '''Will:''' And play nicely until bedtime.
-->'''Rob:''' And go to bed without arguing.
--> '''Will:''' And promise to behave ourselves in the car.
--> '''Lori ''(laughing)'':''' How quickly they learn.
* ''Literature/TheBelgariad'''s Beltira and Belkira. ''"We're sorry, it's - " "Our nature."''
%% * Erin and Shaunee from ''Literature/TheHouseOfNight'', dubbed "the Twins" out of personality rather than resemblance, which is more SaltAndPepper.

[[/folder]]

[[folder: Recorded and Stand-up Comedy ]]

* The comedy duo, [[http://www.stoneandstone.org/ Stone and Stone]]. SiblingYinYang and IncestSubtext ahoy.

[[/folder]]

[[folder: Live Action TV ]]

* Gem and Gemma from ''Series/PowerRangersRPM'' are an extreme case, as it is exceedingly rare for them to individually speak in complete sentences- usually they alternate words or phrases.
* The Sklar brothers of ''Series/CheapSeats'' (Also a staple of their stand-up routine.)

[[/folder]]

[[folder: Video Games ]]

* The Lutece twins in ''Videogame/BioshockInfinite''. Played with in that they're not so much twins as they are [[spoiler: gender-swapped alternate-reality versions of the same person]], so it makes sense they can play off each other very well.

[[/folder]]

[[folder: Web Original ]]

* ''{{Duumvirate}}'': Dumumvirate bicker duo-style, without sentence-finishing.
* [[http://www.teganandsara.com Tegan & Sara]].

[[/folder]]

[[folder: Western Animation ]]

* Jeremy and Ian from ''WesternAnimation/BarbieAndTheDiamondCastle''. They even banter ''in song''.
* ''WesternAnimation/TheCorsicanBrothers''
* The Tibble Twins on ''WesternAnimation/{{Arthur}}'' do this often, competing with each other and often getting into fights.
* ''WesternAnimation/KimPossible'': Jim and Tim Possible.
* Tomax and Xamot, of ''Franchise/GIJoe''.

[[/folder]]
----