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Mistaken for an Imposter
Betty: "I can't imagine what got Veronica tonight; she was horrible to her father! She just wasn't herself!" Archie: "Neither was her father!"
Yesterday, Alice was pranked by Bob, who came to work dressed as Superdude. Today, the real Superdude shows up unannounced. Alice sees Superdude and assumes it's Bob again. She says, "Ha, Ha, nice try Bob!" and tries to pull off his mask.

Basically whenever a celebrity, superhero, villain, alien, monster, etc. appears, but other characters who see it are not unusually excited, surprised, or frightened, because they automatically assume it's a hoax, on the basis that another character tried to do something like that earlier.

Related Tropes:

Examples:

    open/close all folders 

    Anime and Manga 
  • In Sailor Moon, the Three Lights are doing a movie that has a monster in it that looks a lot like the actual monster that the Senshi end up having to fight. At first Seiya disguises himself as the monster, meanwhile the actual monster scares the Senshi first. Taiki and Yaten at first play along and run away doing fake screams commenting that Seiya's getting into it too much. Taiki notes that Seiya had a chainsaw (part of the movie monster costume) but the real monster doesn't have one. Then Seiya comes along and they tell him that's enough scaring people, but Seiya is confused because he hasn't done anything yet and he asks where Usagi and her friends are. Then Taiki and Yaten realize that the monster was real and run off, leaving Seiya all confused.
  • An InuYasha episode had a variant of this, the youkai had been dealing with several of Shippo's gimmicks and illusions, and when Inuyasha walked out of the tall grass, he thought it was another trick. It wasn't, as the youkai found out the hard way.
  • In an episode of the 2003 anime version of Fullmetal Alchemist, the Elric brothers are shunned in one town they visit...for claiming to be the Elric brothers.
    • It is implied that at least one townsperson knew the other set was fake, but went along with the ruse out of sympathy for the poor orphans.
  • Hayate the Combat Butler dealt with this (~Ch 255). The characters decided to have a costume party, and then a bunch of real monsters got summoned in their midst. Some of the characters were truly scared (and protected by the stronger characters), others recruited the monsters' services for their own tasks. Not all the characters seem to have caught on they were dealing with actual monsters.

    Comics 
  • Phoney Bone in the Bone series ran a dragon protection racket so that he could run off with all the town's valuables. The hoax becomes far more complicated when a real dragon, who happens to be a good friend of his cousin, intentionally gets caught in his fake snare just to see what he would do.
  • A variant in this Donald Duck comic, "Lost Valley": Donald, who through a series of unfortunate events was roped into becoming a tour guide in the Amazon, comes upon an evil intelligent ape and thinks it's Daisy, who was dressed up earlier as one of them to infiltrate their temple. He then tries to help "Daisy" out of her "costume".
  • Calvin is derailed by this while using his Stupendous Man costume to mess with his class and disrupt one of his tests. Nobody believes Stupendous Man is anyone other than Calvin in a hood and cape.
  • In one early story, Spider-Man was too ill to fight effectively and was easily beaten and unmasked by Doc Ock. His poor performance made everyone think that he was just Peter Parker pulling a really stupid stunt.
  • The Silver Age story "The Batman Nobody Knows" features Bruce Wayne camping with some scouts, and listening to them regale each other with their theories about who/what Batman really is. These stories range from plausible-but-inaccurate to the supernatural. Finally, Bruce leaps from the bushes in his Batsuit to surprise the campers. Much to Batman's amusement, the kids don't buy it.
  • There's an Archie Comics story in which Veronica has Archie masquerade as her dad at the school's father-daughter dance, since Mr. Lodge had to go on a business trip. She gets angry with Archie at some point and then he goes outside, where he finds Mr. Lodge, who cancelled said business trip so he could go to the dance. Mr. Lodge arrives at the dance, but Veronica, still angry with Archie, attempts to expose him and finds out the hard way that she's yelling at her father.
  • In H'el on Earth, Lois Lane mistook Supergirl for a "comely cosplayer" at their first meeting, mostly because she walked into Clark Kent's appartment when Clark and Lois were arguing with each other and romantic jealousy had cropped up.

    Film 
  • In the So Bad, It's Good comedy The Creature From The Haunted Sea, the main characters try to kill a Cuban guard and blame a sea monster. Guess what shows up...
  • Early in Austin Powers: International Man of Mystery, Austin knocks out a waitress and pulls off a wig, revealing that "she" is actually a man (and one of Dr. Evil's henchmen). Later, when he meets Basil Exposition's mother, Austin knocks her out thinking that she, too, is a man in disguise, but it turns out that she is not an impostor and just looks "mannish".
  • A similar thing to the above happened in the first Crocodile Dundee movie. On his first night in America, Dundee is in a pub and meets a 'girl' who turns out to be a transvestite. He cups the man's scrotum to verify this. Later at a party, Dundee meets someone he believes to be a man in drag, tries to find out the truth in the same way, and learns that it is, in fact, a woman. The woman does not seem to mind, and even looks very happy about it.
  • In A Bug's Life, the ants and circus bugs build a 'gigantic' bird costume (maybe the size of a sparrow or a robin) out of leaves and such to scare the desert locusts grasshoppers from stealing their food. The grasshopper leader figures it out, but then a real bird shows up...
  • In The Brothers Grimm, the titular brothers run a monster protection racket, and are called in to clear out another monster infestation... that isn't one of theirs. Their employer, of course, thinks it's their fault and plans to trap them.
  • In Tombstone, Wyatt Earp enters a bar on his first arrival in town and introduces himself to the saloonkeeper...who seriously doubts that he is speaking with the famous Wyatt Earp.
  • In the first Scary Movie, Buffy (who had inexplicably turned into an Alpha Bitch by that point) is killed while thinking the killer is Cindy disguised as him. Even after the killer beheads her, she still keeps ranting about the bad taste of the joke, much to his frustration.
  • In Zorro The Gay Blade, this trope is batted about a few times when the Spanish governor of Mexico hosts a masquerade ball in an effort to trap Zorro. The Alcalde is thrilled when Zorro appears and triumphantly rips off the hero's mask to find his best friend, Don Diego de le Vega (George Hamilton). Other guests arrive, all dressed as Zorro. De la Vega actually is Zorro, of course, but tampered with the party invitations to have everyone appear in a Zorro costume. Then when Zorro actually does appear...
  • In Spider-Man 2, due to Power Incontinence the web-head must use the elevator to leave the building he's on top of. When someone else gets on the elevator, he just thinks Spider-Man is a guy in a spidey suit, and actually compliments Peter on the worksmanship. Peter plays along and thanks him, but also comments that it rides up in the back. Averted in the alternate version used for the Spider Man 2.1 cut where the guy assumes it's the real deal and tries to bring up new advertising techniques.
  • In Days Of Thunder after Cole Trickle wins his first race, his crew hires a stripper/prostitute to dress up as a state trooper and pull their motorcade over, where the woman fondles him, then takes off her clothes and presents herself to him. Later when Cole is in an accident and comes to in the hospital, he assumes the beautiful doctor (then-unknown Nicole Kidman) examining him is a similar setup.
  • In The American President the titular character calls a lobbyist to see about arranging a date, only to be mistaken for a colleague who had wanted to give his Presidential impression. Said lobbyist has an Oh, Crap moment when the President asks her to call the White House switchboard.
  • In Pirates of the Caribbean: On Stranger Tides, Jack Sparrow is repeatedly mistaken for an imposter because everyone knows that "Jack Sparrow" is in London and gathering a crew to find the Fountain of Youth.
  • In Anastasia, the Dowager Empress Marie is thoroughly convinced that "Anya" is someone impersonating her long-lost granddaughter, even noting that "You're a very good actress." Her disbelief is understandable, since she has by this point already interviewed several girls claiming to be Anastasia.
  • Cleverly invoked in To Be or Not to Be, through a bizarre beard transfer between the imposter and the real, but dead Siletsky.
  • In L.A. Confidential, Ed Exley thinks the woman with Johnny Stompanato is a hooker who has had plastic surgery to look like Lana Turner. It turns out to be the real Lana Turner who tosses her drink in his face.

    Jokes 
  • Played with in a string of elephant jokes.
    Q: What did Tarzan say when he saw a herd of elephants in the distance?
    A: "Look, a herd of elephants in the distance!"
    Q: What did Tarzan say when he saw a herd of elephants with sunglasses in the distance?
    A: Nothing. He didn't recognize them.
    Q: What did Tarzan say when he saw a herd of giraffes with sunglasses in the distance?
    A: "Ha! You won't fool me with those disguises this time!"

    Literature 
  • In the Judge Dee novel The Chinese Gold Murders, one character is a Master of Disguise who at one point pretends to be his brother's corpse. At the end, the Judge thanks him for scaring off enemies by pretending to be a ghost, and he tells the Judge he wasn't there and has no idea what the Judge is talking about.
  • Shows up a bit in G. K. Chesterton's work:
    • In The Man Who Was Thursday, an actor named Wilks decided to parody "the celebrated Professor de Worms". He was too good and completely succeeded in convincing all and sundry that he was the genuine article. (The crippled de Worms was a less convincing cripple because Reality Is Unrealistic) Then the police recruited him, because the professor was an anarchist, and they needed someone to infiltrate.
    Before I could fully recover, however, two or three of these admirers ran up to me radiating indignation, and told me that a public insult had been put upon me in the next room. I inquired its nature. It seemed that an impertinent fellow had dressed himself up as a preposterous parody of myself.
    • Deliberately invoked in the Father Brown story "The Flying Stars". At a family gathering, the distant cousin suggests putting on a traditional English pantomime, and he phones his old friend to come play the role of the policeman. Soon enough, the old friend arrives in a remarkably realistic costume and he gives a spot-on reaction to all the slapstick that the distant cousin dishes out for him. And then the policeman turns out to be real, not an actor. And he came to arrest the "distant cousin", who's actually a notorious thief with a taste for theatricality. The thief suggested staging the pantomime specifically to provide a cover to beat his pursuer senseless and escape from the house.
    • In "The Fairy Tale of Father Brown", this trope is central to the mysterious death of a Prussian Prince, twenty years prior. The prince, being very paranoid, had a lot of guards on his estate. That particular evening, the prince snuck out of the castle, alone, on some personal business. As he returned, one of his own guards mistook him for an intruder. Owing to a strange series of events, the prince had a gag over his mouth and couldn't remove it before the guard—following the prince's prior orders—shot him dead.
  • Wyrd Sisters plays with this: Death winds up filling in for the actor playing him in a play. People normally don't see him because of the Weirdness Censor, but now they're expecting to see Death... and he gets stage fright.
  • The Shirley Jackson short story Louisa, Please Come Home concerns a nineteen-year-old girl who runs away from home and returns three years later only to find that she Can't Go Home Again. Because her family thinks she's an imposter after the reward money. Dramatic Irony ensues.
  • A disloyal subordinate uses this against Tuon after Tuon's accidental abduction in The Wheel of Time - Suroth spreads rumors among the troops that some traitor is out in the countryside impersonating Tuon, and should be killed on sight. Since Mat keeps Tuon safe until her loyal bodyguard corps can return her to the capitol, it goes very badly for Suroth.
  • The Baroque Cycle - Jack Shaftoe, a.k.a. King of the Vagabonds a.k.a. l'Emmerdeur, in rags and a slave collar rides a warhorse into a Parisian fancy dress ball (escaping captivity and trying to brazen it out) only to be mistaken for the king (of France.) Until the actual king arrives in his l'Emmerdeur costume, at which point all the noble women who'd been giving their jewelry to the 'fake' l'Emmerdeur feel foolish, and life becomes more exciting and dangerous for Jack (yet again.)
  • A Sweet Valley Twins book had the girls inverting their usual April Fools' Day prank, where they would switch identities. Unfortunately, they had played it so many times that no one was fooled anymore, leading Jessica to decide that they would not switch that year. . .only for everyone to of course assume that they had done so and end up making the girls miserable all day—Jessica was given all of Elizabeth's assignments and Elizabeth was dragged off to cheerleading practice, despite their repeated protests that they had not switched.
  • In "The Brain Stealers of Mars", Rod Blake encounters a shapeshifting alien plant-thing that disguises itself—poorly—as his partner Ted Penton. He shoots it and it turns into a bat and flies away. He's still in the grip of hysteria when another Ted-Penton-thing shows up, and Rod shoots at it too. Of course, this one is real.
  • Deliberately done by the superhero Dark Flame in Relativity. In order to sneak into a costume party, she removes her wig in order to look less like herself... and more like someone else dressed as her. It works.
  • Played for Laughs in The Last Ditch. When Cain note introduces himself to the freighter captain transporting the Valhallan 597th, the man cracks up laughing.
    Course you are. Nice one. Bet the fems fall for that all the time, eh?

    Live Action TV 
  • This trope was played deliberately on Big Brother Australia. The housemates had to play as paparazzi and were shown celebrity impersonators whom they had to photograph. The Pamela Anderson impersonator turned out to be the real Pamela, and the housemates were genuinely surprised by this.
  • In Ned's Declassified School Survival Guide, Cookie tries to get into the all-girls book club by dressing up as a girl, and Moze catches on. Then, when a teacher enters, Moze starts attacking the teacher, but finds out that the teacher really is a woman.
  • Supernatural features a writer who gets visions of Sam & Dean's adventures and uses them for plots in a series of books called "Supernatural." Sam & Dean get tricked into attending a convention for his fans, where almost everyone male is LARPing as them, and are forced to masquerade as just really obsessed fans in order to stop an actual ghost without interference. But later, two of the fans find out some of the secret and volunteer to help, despite the danger unwittingly telling Sam & Dean that it's what Sam & Dean would do. Then everyone who works at the hotel and all the fans witness the ghost attacking them, forcing them to accept the supernatural, but luckily for all involved, the author saves them.
  • In a similar, though more comedic vein to Supernatural, The Ghost Busters does this at least a few times. The funniest is in "The Phantom of Vaudeville." The titular phantom mistakes the Ghost Busters as a comedy duo who'd stolen his act many years before—the kicker is that the duo actually existed, and had a third banana in the form of a man dressed as an ape ( in the context of the show, Tracy is a real gorilla). When the Phantom tries to forcibly unzip Tracy's "costume," he gets a...shall we say, less than pleased gorilla on his hands.
  • The Science Fiction Sketch from Monty Python's Flying Circus plays with this a bit: A detective thinks that a blancmange-shaped alien is the notorious criminal Jack Riley, a blancmange impersonator and cannibal whom he'd encountered before, coming to the police office to turn himself in. (It Makes Sense in Context...)
  • The Sarah Palin opening sketch on Saturday Night Live where Alec Baldwin mistakes Palin for Tina Fey (see Real Life, below).
  • In a Halloween episode of Hannah Montana, Miley (as Hannah) is mistaken for her evil identical cousin by her best friend, Lilly...who comments on how bad her imitation is.
  • At the end of an episode of Cheers, a patron comes into Cheers claiming to be Boston Red Sox star Wade Boggs. The gang assumes he's an impostor sent by rival bar, Gary's Olde Towne Tavern, to prank them, and bum rush the guy, dragging him outside and stealing his pants. When Carla rifles the guy's wallet, she finds his drivers license... which IDed him as "Wade Boggs". The gang decides this counts as a win, because they now have Wade Boggs' pants.
  • The Thin Blue Line: after a succession of student pranks for Rag Week, Inspector Fowler single-handedly arrests (and insults) a group of armed, masked bank robbers, assuming it's another joke.
  • An episode of Angel had the team going to a library, along with Lorne, a green, horned creature from another dimension. A librarian sees them, and after a moment of shock, decides that he's there for a children's storytime. She then comments that his horns need work, but must be difficult to put on. Lorne replies "You have no idea".
  • In the NCIS episode "Witch Hunt", the team bursts in on a suspect, guns drawn, only to find a Halloween party in progress. The partygoers clap; one of them says, "Great costumes, but you misspelled CSI."
  • Goes badly in Only Fools and Horses when Del hires a stripper to pretend to arrest his uncle for his birthday. After his car is seen driven erratically (by Rodney) Del assumes the policewoman who come to question him about the incident is revenge. He is arrested for indecent assault.
  • In an episode of The Drew Carey Show, Drew's brother faces termination for being a cross-dresser, just after being hired to work in the cosmetics department. Drew challenges fire-happy Mr. Wick to differentiate transvestites from actual women perusing the store. Wick believes he found a "bad" impersonator of Dionne Warwick, but it was actually her.
  • In an episode of Herman's Head, Louise answers the phone and laughs at the woman who says she's Maureen McCormick, better known as Marcia of The Brady Bunch. A minute or two later, Mr. Bracken storms out of his office and states that his good friend Maureen McCormick just called him and said that a woman with a voice like a cartoon character made fun of her. This doubles as a lampshade on the fact that Louise is played by Yeardley Smith, who voices Lisa on The Simpsons.
  • On CSI: New York, a badly-injured man who'd been buried alive staggers out of a cemetery and stumbles down the street, covered in blood and grave earth ... straight into a flash mob of people dressed as zombies. Nobody notices his genuine distress until it's too late, and he dies from his ordeal and previous injuries.
  • In the JAG episode "Imposter", Clark Palmer had Rabb tied up in his apartment and impersonated Rabb in court to frame an innocent defendant in court with planted evidence. When Rabb eventually gets back to JAG the Marine security guards thinks he's the imposter.
  • On Justified Dewey Crowe impersonates US Marshal Raylan Givens in order to rob a group of criminals who stole a shipment of Oxy from the Dixie Mafia. His plan goes without a hitch but the criminals soon realize that they have been conned and go looking for Dewey. However, Raylan gets there first and when he identifies himself, the criminals refuse to be fooled again and open fire.
  • On Good Luck Charlie, PJ leads the other workers at Quickie Chickie on strike leading them to get fired. Bob dresses up like Corporal Chickie to try to get them re-hired. When the manager refutes "Corporal Chickie's" creds, another Corporal Chickie comes in, this time, the real one.
  • In the Sherlock episode "The Empty Hearse", an eccentric DVD-seller comes into John's surgery and John thinks he's actually Sherlock in disguise. He isn't, but the scene pays homage to a scene in the equivalent short story, where Holmes turns up at Watson's house disguised as an eccentric bookseller.

    Radio 
  • In one of the Sherlock Holmes shows with Basil Rathbone and Nigel Bruce, Watson, making his rendezvous with Holmes, says that Holmes' disguise is too over-the-top to be convincing, because no woman is that ugly... The woman slaps him, and then Holmes shows up.

    Theater 
  • In Anything Goes, Bishop Henry T. Dobson boards the ship while Moonface Martin is also on-board masquerading as the ship's chaplain. The local authorities are warned that a criminal is masquerading as a priest and, predictably, haul off the protesting Bishop.
  • In Cash on Delivery, Eric Swan has coerced his friend and roommate Norman to dress up as a woman, whereupon the head of the Social Security, a female, shows up unexpectedly. Eric, thinking that the woman is a dressed-up Norman, proceeds to not onyl comment on how Norman "made the breasts too big" but proceeds to juggle and motorboat said mammaries.
  • A variation in Little Me: On a sinking ship, Noble Eggleston continually confronts the captain, who is trying to flee by disguising himself as a woman. Around the third time or so, he confronts the captain again, but this time it's actually a woman. He apologizes to her, saying, "I'm terribly sorry, madam. The captain wears the same kind of dress."
  • In "Nothing's On," the play-within-a-play in the comedy Noises Off, a sheik comes to look at the house where a series of misunderstandings have led everyone to be very angry at the man of the house. Unfortunately, the sheik and the house owner are identical strangers (which the director sarcastically chalks up to the long-lost prequel). The sheik is promptly accused of trying to avoid "his" (the house owner's) lumps by donning a ridiculous disguise.

    Video Games 
  • In the game Prototype, one of the abilities Alex Mercer gains is "Patsy", faking out the military by accusing one of their own of being a shapeshifting mutant. And, of course, since Alex himself is the shapeshifting mutant they're hunting...
  • In Suikoden V, Euram falls for one of these.
    • The main character from the second game has that happen to him when you recruit Hoi (a actual imposter of the hero) he gets actually beat up by a angry bunch of villagers along with the real imposter
  • In the online game Legends of Zork, at the end of the quest "Antharia Jack and the Hat Mislaid", it turns out you've been trying to find Antharia Jack's hat for a crazed fan rather than the real Antharia Jack - and furthermore, there's an entire fan club in town devoted to dressing up like him. This culminates in you irritably pushing aside the real Antharia Jack, who comments that it's been the third time it's happened to him that day.
  • In a sidequest in Paper Mario: The Thousand-Year Door, Mario is given the task of helping a die-hard Luigi fangirl meet the man himself. Unfortunately, Mario's brother is unavailable, so Mario has to dress up as Luigi and meet the fan instead. While he is doing so, the real Luigi shows up and the obvious happens. Made worse by the fact that Luigi asks Mario to back him up, only for him to play dumb about it.
    • The penguin detective also thinks that Mario, in his regular clothes, is Luigi, no matter who tries to correct him. When Bowser shows up and tries to intimidate the detective into handing over the Crystal Star, he is thus told that Luigi has already made off with it. He doesn't take it well.
    • Near the beginning of Super Paper Mario, Mario visits a wizard to get a new power, only for the wizard to assume he's an impostor because his appearance matches that mentioned in the Light Prognosticus prophecy.
  • In Tales of Monkey Island Chapter 2: The Siege of Spinner Cay, when Guybrush thinks the human LeChuck is an impostor:
    Guybrush: Sooo... you say you're human now, huh? Well, [snaps his finger] let's just see what happens when I ...PULL OFF YOUR MASK!! [jumps at LeChuck's face]
    LeChuck: Owwch!! Guybrush, stop that! [pushes him off]
    Guybrush: [understands] Huh. Okay... maybe you are human. I still don't like you.
    LeChuck: Be that as it may, we still must work together to retrieve this Summoning Artifact!

    Webcomics 

    Western Animation 
  • In an episode of Strawberry Shortcake, Custard and Pupcake dress up as crows in hope of faking out a fairy who was Playing Sick. It doesn't work, but later, when a real crow shows up, the fairy derides it for trying to trick her again, and she even pulls out a feather before realizing it's the real thing.
  • Played with in the Phineas and Ferb episode "Get That Bigfoot Outta My Face". At one point, the titular characters rig up a false Sasquatch to scare their friends and Candace; when a much more realistic Bigfoot shows up, Candace runs it down talking about how clearly it's fake, then the kids run in terror when she is eaten by it. Turns out, though, that Candace, her grandparents, and her grandmother's identical twin had put it together as a prank of their own.
  • There's an episode of Sponge Bob Square Pants where SpongeBob sees a gorilla and concludes that it must be Patrick in a costume. Patrick walks up, but the gorilla takes off its mask to reveal the real Patrick. The fake Patrick takes off its mask to reveal a gorilla. This is subverted later?when SpongeBob wonders why a gorilla is underwater. The Gorilla tries to explain why he's underwater only to say "They're onto us!" and ride off into the sunset on a pantomime horse.
    • Another SpongeBob SquarePants example: In the episode where Mrs. Puff is in jail and she likes it better than teaching at boating school, SpongeBob and Patrick tried to break her free. Of course, Mrs. Puff didn't want to leave. One of their attempts to get her out was donning perfect disguises of prision guards. After they left, two real guards came to see Mrs. Puff. Thinking that they were Spongebob and Patrick wearing disguises, she pulled off their faces.
      • On two occasions, SpongeBob is being kicked out of some place: the first time it was a tough-guy club and the second time it was a slumber party. Each of these times, someone who looks a lot like SpongeBob shows up. In the first instance, the bouncer tries to pull off SpongeBob's wig (the preceding scene suggested SpongeBob to get a new haircut) which looks like black greaser hair, only to see the real SpongeBob show up in a blatantly obvious rainbow wig, and let the Mistaken for an Imposter person inside. In the second, it is a girl who wants to go to Pearl's party, but is kicked out because the partygoers are annoyed with SpongeBob. She runs off crying, and SpongeBob comments, "Whoever that was, she was uuugly!"
      • Spongebob also does this to Mr. Krabs when Plankton replaces him with a robotic suit. For some reason Spongebob is unable to tell the difference between the real Mr. Krabs, and the robotic Mr. Krabs. Keep in mind the robot constantly acts like a backfiring truck, talks in a robotic voice, and acts very suspiciously. Then again, it's Spongebob.
  • An old Donald Duck cartoon, "Donald Duck and the Gorilla", had Donald's nephews pretend to be an escaped killer ape to scare Donald. He catches them, and when the actual killer ape shows, he slaps it around a few times before realizing what it is and running for his life.
    • Also, in another Donald Duck cartoon, "Lion Around", two of Donald's nephews dress up in a lion costume to scare Donald while the third nephew goes for a yummy pie. However, one slip-up has Donald discover who the "lion" really is and shoos the nephews out of the house. Then a real mountain lion shows up and goes to Donald's house in an attempt to eat him and the pie. However, Donald thinks the actual lion is just his nephews in costume and tries shooing it away, but the lion persists and enters his house. At once Donald becomes infuriated and even attempts to rip off the lion's head, but then one of his nephews knocks on the window and tries convincing Donald that the lion is real by showing him the costume, which the nephews had taken off. It takes Donald a few seconds to realize that the "lion costume" he attempted to "take off" is actually a real lion, whom he had just ticked off! Oh, Crap!
  • In the Hey Arnold! episode "Ghost Bride", this happens with two separate impostors before the real ghost shows up.
  • A good number of the Scooby-Doo movies have a mundane impostor followed by a real supernatural entity.
  • An episode of Jimmy Two-Shoes, had Heloise and Beezy are fighting over who gets Jimmy as their houseguest. Lucius comes to Heloise's house when she has Jimmy to go over something work related with her. She mistakes him for Beezy in disguise, and launches him into the sky.
    • This is a case of Forgot About His Powers, since Heloise would usually be smart enough to realize that Beezy is too big to pose as Lucius. To make this point clearer, Beezy disguises as Heloise later in the episode, and Jimmy sees right through it.
  • The first episode of The Flintstones had Fred thinking Barney was throwing a party without him. In response he tells a friend to dress as a police officer and come to the party complaining about the noise. Said party turns out to be a suprise birthday part for Fred, who quickly gets into it. Naturally, the noise gets too loud, and a cop shows up...
  • In The Simpsons, Homer annoyed Moe one too many times, and Moe kicked him out of the bar. Soon Homer reappears, dressed in a top hat and natty suit, sporting a handlebar mustache, calling himself "Guy Incognito." Moe beats him up and kicks him out of the bar again (in an unconscious state), only to have the real Homer show up and remark on the uncanny resemblance. Link.
  • In Yogi's Great Escape, Yogi and his friends keep trying to scare away ranger Smith and a trapper accompanying him by dressing up as a ghost. Later on, when the ranger corners Yogi in a room, a real ghost shows up and Yogi assumes it's someone else in a costume.
  • An episode of Pinky and the Brain has the duo grow to gargantuan size, while Pinky wears a Gollyzilla costume. Brain hopes to let Pinky "rampage" a bit, and then come out to save the day. Unfortunately, Brain runs into the real Gollyzilla.
  • In an old Looney Tunes short, Porky enters a bullfighting competition and has two friends dressed as a bull for him to fight. The friends get drunk and wander off, so Porky ends up fighting the real bull. It's only when the two guys appear singing drunkenly on the sidelines that Porky realizes the trouble he's in and starts running.
  • It's done in Garfield's Halloween Adventure. The first time Garfield does that, it's just a kid in disguise. The second time... it's a scary monster disguised as Bedsheet Ghost. The third time... a monster wearing a mask that looks just like its face. The fourth time... a Bedsheet Ghost with, well, nothing under the "bedsheet".
  • Tiny Toon Adventures:
    • The episode, "Music Day" has a cartoon where Buster spends the majority of it spoiling a children's concert hosted by the Raffi Expy Ruffee, while dressed in a diaper and a green bonnet. When Ruffee finally does reach his breaking point, he yells at who appears to be the disguised Buster, but when he picks him up, he's actually a human baby dressed in a nearly identical way. This proves to be a big mistake when said human baby's oversized father scolds Ruffee for doing so, and later beats him up.
    • In the first wraparound of the episode, "Stuff That Goes Bump in the Night", Babs scares Buster by dressing like a devil. In the third wraparound, a Two-headed Monster sneaks up behind Buster, who thinks it's Babs in disguise again. The real Babs shows up, and the two bunnies run for their life from the Two-headed Monster.
  • In the Family Guy episode, "Business Guy", Lois gets her Father, Carter to dress up like a Swamp Monster to trick Peter into signing Pewterschmidt Industries back to him. At first, this example appears to be averted, but then the real Carter shows up in a Swamp Monster costume and he and Lois run away from the real Swamp Monster who is later revealed to be a disguised Gregory House.

    Real Life 
  • Quite a few celebrities attending conventions like Comic-Con have been mistaken for cosplayers.
  • There is a disorder known as Capgras delusion, that causes the person affected to believe the people closest to them have been replaced by imposters.
    • Inverted with the Fregoli delusion. Where you believe multiple people are actually the same person in different disguises.
  • Charlie Chaplin entered a Charlie Chaplin Impersonation contest.... and came in third.
    • The contest was to impersonate the Tramp, one of Chaplin's most popular characters. The judges noted his perfect impression, but he lost points for showing up on the spur of the moment with no costume.
    • Larry the Cable Guy had a similar experience in Las Vegas at a club where people did celebrity impressions. He played himself, and interviews of people leaving said he did the jokes well, but didn't sound the same.
  • An audience member was asked to leave a showing of The Rocky Horror Picture Show because he was a Tim Curry impersonator. The member: Tim Curry himself.
  • Similarly, Christopher Walken once had a guy in a diner say to him: "quit doing that stupid Christopher Walken impersonation. It's getting annoying."
  • When appearing at science fiction conventions, Claudia Christian of Babylon 5 fame will often recount the story of how she once attempted to join a B5 discussion group, only to be chased off by the regulars as an allegedly clumsy and unconvincing impersonation!
  • In the 60's, Brazilian rock'n'roll musician Raul Seixas once showed up to perform so high that he couldn't sing his own songs. That led to the audience thinking he was an impostor and calling the police.
  • Dolly Parton once lost a Dolly Parton look-a-like contest.
    • It gets better: the other contestants were all drag queens.
  • The late Jeremy Beadle hosted a hidden-camera prank show called Beadle's About during the 1990s. He would appear in disguise (usually as an authority figure like a policeman or traffic warden), wind up the victim a little more, and then reveal that it was all a set-up for the TV. The downside? There was at least one case of a member of the public mistaking a real policeman for Jeremy Beadle, and attempting to pull his "disguise" off ...
    • Similarly, Candid Camera host Alan Funt was once on a flight that was hijacked and flown to Cuba. Because everyone on the plane recognized him, he was the only passenger to realize that this wasn't a joke.
  • In 2008, Tina Fey became famous for playing Sarah Palin in a Saturday Night Live skit. When the real Sarah Palin later appeared on the show, she was briefly mistaken for Tina Fey.
  • Minecraft servers often get players logging in, claiming that they are one of the game developers. This led to an incident where jeb_ joined a server, only to be told that he's "not the best fake I've ever seen".

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alternative title(s): Mistaken For An Impostor
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