->''"I see you supized I speak Engrish so werr!"''
-->-- '''Creator/DaveBarry'''

When a character who has been speaking perfect, unaccented English (for whatever region he's in), gets revealed to be a spy or covert operative from some other country, from that point on, he instantly reverts to a thick accent from his native language. A character [[RoboticReveal revealed as a robot]] will suddenly switch to [[MachineMonotone a classic "robot" speech pattern]].

This is distinct from OohMeAccentsSlipping in that it is not a poor acting display by the performer, but instead a deliberate (and inexplicable, unless the character is aware his cover is blown) thing written into the story. Bear in mind that in works using a TranslationConvention, the transition from fluent English to, say, Russian-accented English may represent a genuine transition from English to Russian.

From a linguistic standpoint, it can actually make sense, as maintaining an accent or dialect perfectly is exceptionally difficult until you get extremely familiar with it. Most people would cease to exert the effort if they knew they didn't have to. Makes less sense for a DeepCoverAgent, however -- once you get to the point that you can speak the language at near-native level, then it's harder to revert ''back''.



[[folder:Anime and Manga]]
* Inverted in ''Anime/OnePunchMan'', when Genos tries to interrogate a cybernetic adversary, who is dismissive of his power in a RoboSpeak voice until witnessing Saitama's SuperStrength, after which he starts blabbing in a very conventional voice. When Saitama asks what happened to his voice, he admits he was just putting it on to sound cool.

[[folder:Comic Books]]
* Wolfsbane from the ''ComicBook/NewMutants'' initially had a Scottish brogue, which she lost during the second volume of the series. She inexplicably began using her accent again in ''Comicbook/XFactor'', which was eventually explained in an issue of ''New X-Men''. Turns out she tried to hide her accent from her friends in order to seem "cool," but no longer felt any pressure to do so once she joined X-Factor.
* ''ComicBook/XFactor:'' Siryn (also of X-Force fame) normally speaks without any discernible accent, so much so that the only way to know she was Irish would be if the reader already knew. During the fight with Cortex ([[spoiler:A heavily altered version of one of Jamie Madrox's dupes, whom she's already violently angry with]]) she gets so mad, she starts "getting her Irish up".
* In ''ComicBook/ThePunisherMAX'' arc "Kitchen Irish", the story revolves around a group of criminals who all have a connection to a recently deceased [[TheIrishMob Irish Mob]] boss who has sent them each a piece of a map that will show where he hid the riches he amassed over his life. The associate of one of them, Michael Morrison, slips into his natural Irish accent when his boss Finn Cooley surprises him after having taped on his multilated face after losing a mask designed to keep it on. Michael asks if it'll slip, and Finn snarks "You mean like your accent?" Much later, after multiple clashes with each other and The Punisher, the criminals all gather in a bar to put together their pieces of the map. After they see where the treasure is, they all get ready to kill each other. Michael smashes his drink on the bar counter, and in a heavily accented speech tells them that they don't need to keep killing each other, and they don't need to bring the horror of UsefulNotes/TheTroubles to the States. They all put their guns away.

[[folder:Films -- Live-Action]]
* ''Film/SpiesLikeUs'': Once the [[spoiler:mission contacts]] are revealed to be Russian spies, in the subsequent interrogation scene, they have thick Russian accents.
* ''Film/TheRocketeer'': The Nazi spy, [[spoiler:Neville Sinclair, played by TimothyDalton]], after speaking perfect English the whole movie, ZUDDENLY HAZ ZE GERMAN ACCZENT VUNCE HE ISS EXPOZED, JA!
* Norm in ''Film/TheresSomethingAboutMary'': he even forgets himself and nearly uses his real accent in front of the woman he was trying to fool, before trying to recover but giving up and telling the truth. Justified, in that he was putting on an upper class English accent and is actually American.
* Done by Ann-Margaret in NeilSimon's ''The Cheap Detective'', when detective Peter Falk tricks her into revealing that she's Russian -- she is unable to pronounce the word "baubles".
* In ''Film/CarryOnDick'', whenever Madame Desiree is found out to be a Cockney, or just gets really angry, she drops her French accent. Doesn't stop her from trying to regain this facade though.
* Was supposed to happen with Dr. Scott in ''Film/TheRockyHorrorPictureShow'', but for some mystifying (to O'Brien and the audience alike) reason Jonathan Adams had an accent even before being called von Scott.
* Done in ''Film/SpyHard'', after Dick Steele (agent WD-40) makes love to a woman, she is revealed to be a spy for General Rancor with a heavy Russian accent. Apparently, she doesn't slip into her native accent even in the throes of passion but drops it immediately before trying to shoot Steele. He doesn't notice it, though.
* ''Film/NoWayOut'': At the end of the film, TheMole is finally revealed to the audience. As he is being interrogated by his superiors, [[spoiler:Kevin Costner's character]] apologizes for his poor Russian accent with the excuse that he's been speaking English for so long that he's become rusty.
* ''Gotcha!'' (1985). The exotic European FemmeFatale who seduced the protagonist into a spy operation is revealed to be a CIA agent when she loses her accent during an argument with him.

* In ''Literature/TheLiesOfLockeLamora'', Locke drops his false [[FantasyCounterpartCulture Vadran]] accent the few times he's completely found out.
* In ''[[Literature/TakeshiKovacs Altered Carbon]]'', Reileen Kawahara spends most of the story speaking in a very formal, cultured accent in order to project an air of respectability. When she's under great stress and her facade cracks, however, she reverts to speaking in a vulgar Fission City accent.
* Inverted in ''Literature/TheMachineriesOfEmpire'' - as Cheris spends more and more time with Jedao attached to her soul, she starts speaking with his accent.

[[folder:Live-Action TV]]
* ''Series/{{Poirot}}'' does this once with a supposed socialite who reverts from RP to a Cockney accent after being exposed.
* ''Series/DoctorWho''
** Possibly a ShoutOut to the above, the same thing (a supposed socialite who reverts from RP to a Cockney accent after being exposed) happens in "The Unicorn and the Wasp", the Creator/AgathaChristie homage episode.
** In the episode "Love and Monsters", the alien speaks English with a rather affected and unconvincing posh Southern accent when disguised as a human, but when he's unmasked as an alien, his accent shoots way OopNorth (the actor's natural accent).
** In "Tooth and Claw", the Tenth Doctor puts on a Scottish accent while trying to pass as a native of the Scottish highlands. Later, whilst being chased by the monster of the episode, he forgets to keep using the accent and is caught by Queen Victoria, helping her resolve in rejecting the Doctor's world. Notable in that Creator/DavidTennant, the actor playing the Tenth Doctor, is actually Scottish, although the accent he uses in the episode isn't his regular accent.
* On ''Series/{{CSI NY}}'', a man pretending to be Jewish is revealed to be a German former Hitler Youth soldier. Even after 64 years of pretending to be a non-practicing Polish Jew, marrying a Jewish woman, and raising an Orthodox Jewish son, he reverts to his German accent when his crime is revealed.
* Happens to a German spy who has tried to infiltrate the POW camp in ''Series/HogansHeroes''.
* Spoofed in ''Series/GetSmart''. Max asks why TheMole is suddenly speaking in a fake German accent after being unmasked. He replies, "Vot accent? Zis is my veal voice!"
* Inverted on an episode of ''Series/{{Bones}}'': the intern with the thick Middle Eastern accent slips into his actual American accent. It turns out that he was faking the accent to avoid having to explain to the practically StrawAtheist Brennan and Squints why he took his religion so seriously: if he was an immigrant, it would make sense for him to clutch at his roots, but he apparently felt that the members of Brennan's team wouldn't be able to understand why a rational, scientific mind like theirs could not only be religious, but ''devoutly'' so. Bonus points for Bones actually noticing that he got the accent ''wrong''. He was supposed to be Iranian but his fake accent was Jordanian. Bones knows these things but didn't think it important enough to ask.
* More of a Personality Relapse, but before being revealed to the audience as a Terminator in ''Series/TerminatorTheSarahConnorChronicles'', Cameron talks and acts like a perfectly natural teenage girl. Afterwards, even in situations when she's with people who don't know she's a Terminator, she seemingly loses this ability to act natural and instead stares at people oddly and is generally robot-y in her speech patterns and reactions.
* Inverted in ''Series/{{Blackadder}} Goes Forth'', where a British spy who has been spying on Germany returns and ''retains'' his extremely heavy German accent, causing others to assume he was a German spy.
* At least a couple of examples from ''Series/TwentyFour''.
** In season 1, the Serbian man impersonating Ted Cofell spoke flawless English with a neutral American accent. However, after his cover was thoroughly blown and Jack Bauer began to interrogate him, he cursed Jack in Serbian and spoke in a thick Serbian accent.
** In season 8, the assassin Davros, in his cover identity of an NYPD officer, speaks in a New York accent when trying to get a coworker to switch shifts with him, but once it becomes clear that the guy won't budge, Davros pulls out a gun and switches to a Russian accent.
* In an episode of ''{{Series/Chuck}}'', the titular character encounters a British handler (played by TimothyDalton) who turns out to be the criminal mastermind Alexei Volkoff. When he reveals himself, he suddenly switches to a very bad Russian accent. In the subsequent episodes, though, he speaks with a perfect British accent, even in his Moscow headquarters. Later explained when he turns out to have been British all along, just brainwashed to think he was Russian.
* UsefulNotes/AmericanAccents version, in ''Series/{{Warehouse 13}}'' Sally Stukowski dropped her Texan accent when Mrs. Frederic informed her they knew she was from Connecticut.
* On ''Series/JustShootMe'', a couple pretending to be Nina's birth parents drop their facade in the elevator and start speaking French as they discuss the next phase of their plan.
* Grand Maester Pycelle in ''Series/GameOfThrones'', who is a master at ObfuscatingStupidity, spends most of his time in public pretending to be a doddering old man, complete with a weak, quavering voice. In the S2 Finale, however, when he is alone with Tyrion he drops the act entirely, conversing in his natural, strong voice.
* Inverted in ''Series/{{MASH}}'' in the episode "Dear Comrade". Kwang, a spy for the Korean People's Army, masks his perfect fluency in English with broken Korean Engrish. Over the course of the episode, he becomes fond of a couple of the personnel on the base, and before going back to his division he decides to have a drink with them. Heavily inebriated, he declares that "When all is said and done, you're not such bad fellows!" and B. J. points out that the drunker Kwang gets, the better his English becomes. Kwang hesitates before replying that "it must be the whiskey", and pours himself another drink.
* The criminal of the week in ''Series/{{Elementary}}'' is encountered by a detective in a hospital and speaks perfect American English. After the cops finally figure out that she's a French national, she suddenly slips into her "natural" accent (the actress is American). Later on, [[spoiler:Irene Adler]] drops her pretty convincing American accent for her natural British one after being revealed as [[spoiler:Jamie Moriarty]].
* On ''Series/{{NCIS}}'', [=McGee=] falls for a pretty girl with an American accent--but the romance takes a twist the day after she shows up at HQ to see him, despite the fact that he never told her that he's an agent. Her accent immediately collapses (and it's revealed that she's actually a South African agent).
* Inverted in ''Series/PersonOfInterest''. In "Sotto Voice", Detective Fusco is interrogating a frightened Middle Eastern man who was arrested with a handgun, which he protests was only bought for self defense. Fusco discovers that the weapon was used in a number of homicides, whereupon the man drops his accent and reveals himself as a SmugSnake ProfessionalKiller.

* Half-way through the ''AudioPlay/BigFinishDoctorWho'' drama "Invaders from Mars", the character Glory Bee suddenly reveals that she is vorking for Matherr Rasha, ant hencefarth eess eencapable off maintaining her prreeviasly parrfect Amarricn aksant.

* In ''Theatre/SweeneyToddTheDemonBarberOfFleetStreet'', when Sweeney Todd is visited at his shop by Adolfo Pirelli, the SnakeOilSalesman that he showed up in an earlier scene, Pirelli reverts to an Irish accent, revealing his actual non-professional name to be Daniel Higgins.

[[folder:Video Games]]
* In a mod for ''Videogame/Portal2'' called ''Videogame/PortalStoriesMel'', Virgil pretends to be Cave Johnson for a while. His impression is pretty convincing, until his Norwegian accent begins to slip through.
* In the TabletopGame/{{Clue}} VCR game from the '80s, Miss Peach reveals herself to be M. Brunette's daughter and therefore French. She subsequently delivers most of her remaining dialogue with a French accent (as opposed to the Southern drawl she'd used until then).
* In ''VideoGame/FreedomFighters'', once [[spoiler:your advisor with suspiciously accurate information]] is revealed to be a Russian general, he is calling out to you through a sewer. Your character does not recognize his voice until he uses his disguise American voice once more.
* In ''VideoGame/BioShock1'', [[spoiler:Fontaine speaks with an Irish accent as Atlas, and with a thick Bronx accent as himself.]]
* When the Spy in ''VideoGame/TeamFortress2'' is disguised, his voice clips change to match that of whoever he's disguised as. Which is more a gameplay mechanic, but fits the trope because he reverts to his normal accent once he drops the disguise.
* ''VideoGame/FinalFantasyXIII'': When Vanille first shows up, she slips in and out of an Australian accent to the point where it sounds like it's a bad case of OohMeAccentsSlipping, but after [[spoiler:you find out she's from Pulse]], she gets the accent full-time, matching Fang's.
* In ''VideoGame/StarWarsTheOldRepublic'', the Imperial Agent normally speaks with a thick British accent common to the rest of the Empire, but when s/he goes undercover he drops the accent completely. If his/her cover is blown at any part of the story s/he drops the accent once s/he's positive they know s/he's a spy and not just bluffing him/her.
* ''VideoGame/Medievil2'', the BigBad Lord Palethorne speaks in an RP accent to keep up an image of being an aristocrat, but whenever he gets sufficiently angry ([[HairTriggerTemper which is often]]) he slips into a Cockney tilt.

[[folder:Visual Novels]]
* ''Franchise/AceAttorney'': Though not a spy, Maximilian Galactica speaks in a very CampStraight manner, until things start to get a little to stressful. Then he breaks down and starts weeping and talking with a heavy southern accent.
* ''Franchise/DanganRonpa'':
** In the English dub of [[VisualNovel/DanganRonpa the first game]], this happens to [[spoiler:Celestia Ludenberg]] during the third trial when her classmates start to figure out her plan.
** In the sequel ''VisualNovel/SuperDanganronpa2'', [[spoiler:Teruteru Hanamura]] slips into a rural accent when he's exposed in the class trial. His accent becomes so thick and fast that Monomi has to translate it.

[[folder:Western Animation]]
* When the King of the Renaissance Faire is deposed and hit with a sexual harassment lawsuit on ''WesternAnimation/KingOfTheHill'', he immediately reverts from YeOldeButcheredeEnglishe to a thick Texas accent. Even funnier when you realize the voice actor in question is Creator/AlanRickman.
* ''WesternAnimation/TheAvengersEarthsMightiestHeroes'':
** In the episode "Code Red" , after Captain America discovers Dell Rusk, who spoke with an American accent (Steven Blum's voice), is actually Red Skull, he rips off his disguise. Once the mask comes off, the Skull's German accent is back on.
** Black Widow speaks in an American accent when among the good guys and a Russian accent when among the bad guys.
* In ''WesternAnimation/RegularShow'', [[spoiler:Thomas]] starts speaking with a thick accent after he is revealed to be a Russian spy.
* In ''WesternAnimation/StarWarsTheCloneWars'', it's established that Twi'leks speak with a "Rylothean" accent that's clearly French. In ''WesternAnimation/StarWarsRebels'', Twi'lek main character Hera Syndulla speaks without the accent, apparently because she spent most of her life among humans away from Ryloth. Until she meets up with her father Cham; when she gets angry with him she slips back into her native accent.