Numbuh One: When I look into Lizzie's eyes, I can tell she's not a jerk.
The inversion of Something Only They Would Say: When a character is pretending to be someone else, they may unwittingly reveal this by saying something that would be out-of-character for who they're impersonating. Variations include not responding to a well-known Berserk Button, doing things they're normally afraid of (or have a similar excuse for never doing), expressing hatred for a nickname they insist to be called by, or otherwise invoking O.O.C. Is Serious Business. A common variation in Japanese media is using the wrong pronoun.
Often Invoked in kidnapping and I Have Your Wife scenarios, to let the heroes know that something is amiss. If the Big Bad is demanding a ransom, this is to alert them to the fact that it's a trap; if he wants the kidnapped to "assure" The Hero that the kidnapped is "in fact" okay, this is to secretly convey that they're not. Sometimes serves as a Quiet Cry for Help. If they've pre-arranged such an alert, this is a Covert Distress Code.
Real-life military personnel sometimes use hand signals when being taped to communicate in another way with their 'home base'. There are a few documented cases of soldiers giving hand signals (and one case of them just flipping the bird to the camera) to alert the people receiving it that no, they weren't being treated very politely at all. And some have done it just for fun, giving the sign for coercion when forced to shake a politician's hand, for instance.
Compare with Lying Finger Cross (a common gesture used in this trope), Not Himself, Ooh, Me Accent's Slipping, and Trust Password (a pre-arranged alert to confirm one's identity and freedom of action). Contrast with Something Only They Would Say (in which a character is identified by a characteristic) and Bluff the Impostor. Sister Trope to You Called Me "X"; It Must Be Serious and Batman Grabs a Gun. See also O.O.C. Is Serious Business.
- In an early '70s TV commercial for the short-lived Cap'n Crunch variant Vanilly Crunch, the good captain's ship is approached by Wilma the Whale, the mascot for that cereal. After the captain does a description of the cereal, he shoots a cannon at the whale! Turns out that pirate Jean LaFoote (the "bad guy" in these ads) had disguised his now-sinking vessel as Wilma. Cap'n Crunch knew it because he described Vanilly Crunch and the whale didn't smile.
- Fullmetal Alchemist:
- Riza Hawkeye takes advantage of this trope to trick Envy, who is disguised as Roy Mustang, as part of her Batman Gambit. She aims a gun at him, saying that Roy never calls her "Lieutenant" in private. Cue Envy immediately breaking the form, cursing his luck and shouting "I knew there was something going on with you two!" Her reply can effectively be summed up as, "Not really. Thanks for believing me, Envy." Cue epic beatdown.
- Earlier in the series, Roy Mustang uses a similar trick to subtly pass some information to Edward Elric and Major Armstrong. He recommends that the Major take a trip to the east to soothe his frazzled nerves, as the women there are very beautiful. While Mustang frequently makes womanizing comments (part of his carefully crafted persona), this particular remark comes across very oddly because to the east of their country is nothing but a desert, and it seems strange that he would recommend it as a destination. They check it out anyway. It turns out to be where Mustang has smuggled a (rather cute-looking) female officer under Armstrong's command, Maria Ross; she was falsely convicted of murder, and most of the country believes he murdered her since the dead person was his best friend.
- At one point in the first-season finale, Kato, Marucho's butler and occasional Mission Control of the team, tells each separate split-up part of the team to head back to base. Shun, however, notices that something is up. Of all minuscule details, Shun notices that Kato, the unfailingly polite Jeeves of the team, once only referred to Marucho by his name alone, as opposed to his usual "Master Marucho". He sneaks away from the team to investigate, and his suspicions turn out to be correct; it was actually Hal-G hacking into their communications, attempting to drive the team away.
- This trope is a key plot point in the Weiß Kreuz OAV Verbrechen ~ Strafe. During a mission briefing, when asked if she's well, Weiss's handler Manx replies that she's having trouble with her allergy to black lilies. Much later, when Weiss finish springing their trap on the villain who was holding Manx hostage, they reveal that "black lily" is a codeword indicating "lies," and that Manx's comment had alerted them to the fact that the orders given in that mission briefing were fraudulent.
- In the Chuunin exams arc, Sasuke proposes using a Trust Password in case of enemy ninjas using doppelgangers to imitate one of them (again), and makes up a long poem as the passphrase. A few scenes later, Naruto excuses himself to pee, and when he returns he is quizzed for the passphrase, and successfully gives it. Of course, Sasuke knows that the real Naruto would not have remembered such a long passphrase, and that he was being spied on when he made it.
- Also during the Sasuke Retrieval arc. After defeating Jirobou of the Sound Four, Shikamaru disguises as him and catches up with the other three. When he does, Tayuya cusses him out and asks what took him so long. Shikamaru, still disguised, quietly apologizes. The other three immediately realize he's not Jirobou, as Jirobou always chastised Tayuya for using unladylike language.
- Used again much later by the Mizukage to tell that when they found Ao he was being controlled by someone else's technique by the fact that he agreed when she said she would remove the seal around his Byakugan (when none of them could) and apologized to Chojuro (who he had previously been Drill Sergeant Nasty towards).
- When Zetsu clones are infiltrating the allied forces in disguise, Sakura realizes Neji is one when he refers to Tonton as if she were a person, rather than Tsunade's pet pig.
- A peculiar example from K — the Silver King Adolf K. Weismann has lived alone in an airship for decades with no contact with anyone. How, then, does the Blue King Reisi Munakata realize that something has been strange with him and that this should be investigated? Well, for the entire time he's been around, Weismann has flown his airship in "curiously repetitive" flight patterns that always correspond to the optimal path, based on the weather. Since the night of the murder the characters have been investigating, though, the airship has been moving in erratic patterns, completely unlike anything before. Sure enough, it is connected...
- Towards the end of Gonna be the Twin-Tail!!, Souji ends up trapped in a Lotus Eater World in which his various female comrades are throwing themselves at him. It's not until Twoearle starts to tie her hair in twintails that Souji realises something is wrong: the real Twoearle had vowed never to do that again. The fake world swiftly unravels.
- This happens in Fushigi Yuugi when the mirror-Miaka tries to seduce Hotohori to overpower both him and Tamahome, while keeping the real Miaka trapped inside a Magic Mirror. Before she can kiss him, though, Hotohori lifts his sword to stop her. When the mirror-Miaka asks what's going on, Hotohori tells her that Miaka would never behave that way.
- A variant was used in S Cryed: Kazuma, trapped in Unkei's Lotus-Eater Machine Alter, is challenged by that world's Ryuho to a friendly sparring match. They draw, and Ryuho offers him a hand up. This so badly clashes with Kazuma's memory of him that the illusion cracks, and he pulls out his Alter. The illusory Ryuho panics and begs for his life... at which point Kazuma destroys the illusion — the Ryuho he knows would just summon his Alter and counterattack.
- In Tsubasa -RESERVoir CHRoNiCLE-, Princess Sakura is seemingly trapped in a bubble and Syaoran is warned that if he fights back, she'll get hurt. He takes the blows, but when 'Sakura' calls out "Syaoran!", he knows she's a fake because she lost her memory, so she is now polite with him and says his name with the -kun honorific.
- In the Devil's Trill arc of Descendants of Darkness, Hisoka figures out that Tsuzuki is possessed by Sargatanas very simply: first, Tsuzuki doesn't take up an offer to go out to eat, something he would never do. Second, Hisoka mentions that he bought their boss salted cuttlefish since he hates sweets, which doesn't get commented on by Tsuzuki. In fact, the boss is infamous for his Sweet Tooth.
- In Eyeshield 21, at the start of the second half of the Devil Bats' game with the Shinryuji Nagas, Hiruma says their chances of winning are almost 0%, and that the team shouldn't do anything drastic as to harm their future careers. Turns out it was all an act; everybody knows Hiruma would never tell them to give up unless the odds were exactly zero, so everyone (and we do mean everyone) silently went for an onside kick as to not let the enemy know they were changing plans.
- One Piece:
- Vivi begins to suspect that there's something wrong with Usopp when he tells her to abandon the injured Carue, referring to him as "that bird." The real Usopp not only knows Carue's name, but is fairly close to Carue. In fact, it was Mr. 2 (Bon Clay) impersonating him in order to trick her.
- Another example occurs post-Time Skip with the Impostor Straw Hat Pirates, who try to take advantage of the real Straw Hats' infamy to recruit powerful pirates for their journey into the New World; the leader, Demalo Black/Fake Luffy, does so by using Luffy's reputation (especially his rather colorful heritage) to do what he wants. His doing so ends up being one of the main reasons the Marines are able to tell that they're not the Straw Hats, since the real Luffy would never take advantage of his reputation to bully civilians.
- In the Mai-HiME manga, Haruka begins to suspect that she is in a Lotus-Eater Machine when her rival Shizuru humbly says that she should never have competed with her. Haruka points out that she finds Shizuru to be quite arrogant, and that she could never be this happy.
- Dragon Ball Z:
- After Cell absorbs Android 17, he tries to persuade 18 to "join" him by using 17's voice. As he talks about how amazing the power feels, 18 looks uncertain... but when Cell refers to their creator, Dr. Gero, a little too glowingly, 18 sees through it and snaps that she and 17 actually hated Gero for turning them into cyborgs, and 17 would never care about his plans.
- At one point in Dragon Ball GT, Goku knew immediately that a mind-controlled Vegeta is Not Himself because he was calling him "Goku". The real Vegeta always made a point of referring to Goku by his Saiyan name, Kakarot.
- In Dragon Ball Super: During the Tournament of Power, it appears as though Frieza has turned on Universe 7 when he helps Frost attack Gohan. However, Gohan, who has fought Frieza in life-and-death battles in the past, immediately realizes that Frieza isn't being serious in his attacks, which is very strange given Frieza's level of hatred for the heroes; if he really was fighting to kill, he'd be going all out. It turns out to be a charade to get Frost to lower his guard, as he believes Frieza has turned to his side... only for Frieza to immediately knock Frost off the ring without even a fight, and then leave Gohan alone.
- Sailor Moon:
- In Sailor Moon R one of the Monsters of the Week disguise themselves as Chibi-Usa's dear mom (Neo-Queen Serenity, a.k.a, Usagi's future self) and calls to her using the name "Rabbit". Chibi-Usa is at first fooled, happy to see her mom again, and runs to hug her... but then she suddenly stops and asks the monster "Who are you?!" When the monster replies that she's her mother, Chibi-Usa says she's lying because her mother never calls her "Rabbit", which is what the Black Moon Clan refers to her as. (Chibi-Usa's actual mother uses "Small Lady" instead.) In the dub, this is reversed: "Small Lady" is what the Dark Moon calls her, and how she finds out her mother is a fake.
- In the Sailor Moon SuperS Movie, Sailor Moon gets trapped in a dream world while trying to rescue an abducted Chibi-Usa. There she meets Mamoru, but suspects something wrong when Mamoru suggests she abandon her mission and her team to stay with him. Her suspicions are confirmed when she baits him by asking who he likes better: Her or Chibi-Usa — and he easily picks Usagi. This is a Call-Back to earlier in the movie when real Mamoru could not answer this question since he was being asked to choose between his future wife and daughter, both of whom he loves dearly and deeply.
- In The King of Fighters manhua by Andy Seto, Vice attempts to seduce and then brainwash Kyo Kusanagi while disguised as his girlfriend Yuki. Kyo blows her cover when she's about to kiss him and he stops her; he then says that, due to the context they're in, Yuki would actually be upset at him, not throwing herself at him for a kiss.
- In Cardcaptor Sakura, Sakura was confused and hurt because the ghost of her mother Nadeshiko led her to a Death Trap (trying to drown her in the manga, getting her to walk off a cliff in the anime); she asks Yukito about it and he says that a mom would never want her child to be in danger. Later, when the "ghost" tries it again, Sakura remembers this and confronts it, saying "You're not my mom! TELL ME, WHO ARE YOU?!". It turns out it was a Clow Card, more exactly The Illusion, trying to avert being captured. The real Nadeshiko's ghost had actually SAVED Sakura from death via either pulling her out of the pool (manga) or slowing her fall enough for Yukito to catch her (anime).
- In Fresh Pretty Cure!, Love Momozono's mom gets captured and duplicated by a monster. Setsuna, who by that point had been Happily Adopted into the Momozono family, figures it out first, but Love is fooled and gets in a fight with Setsuna because she thought Setsuna was being ungrateful to their mother. Later, Love figures it out because the monster-mother keeps mentioning Chiffon — who Love had never mentioned by name to her parents before. She then tests the fake by putting on a red bracelet that the real Mrs. Momozono had made for Setsuna; the monster-mother tells Love that it looks good on her, which confirms Love that the monster is a fake and allows her to properly confront her — her real mother would know that the red bracelet was made for Setsuna and there was a pink one for Love.
- Saiyuki: When Chin Yisou creates a fake Goku, the team catches on almost immediately, and Sanzo promptly shoots it in the head. When Chin Yisou asks what gave it away, Gojyo explains that Goku would have asked for food the moment he showed up (though Sanzo's dialogue suggests he may have sensed something on a more instinctual level). The scene immediately cuts to the real Goku complaining that he's hungry.
- K-On!: This is one of the things that blows Ui's cover when she's pretending to be her older sister Yui while the Light Music Club are practicing for the second school festival when the latter is sick. The whole club is fooled because of how close they look visually and Ui is really good at picking up things like her sister, so at first they practice without anyone the wiser. But then the band members notice "Yui" keeps time too well. In the ensuing discussion, she calls Azusa, Ritsu, and Tsumugi the wrong honorifics ("Azusa-chan", "Ritsu-san", and "Tsumugi-san"; Yui uses "Azu-nyan", "Ricchan", and "Mugi-chan"), and when challenged Ui could not produce Yui's nickname for Azusa. Astute viewers can also catch "Yui" wearing the wrong color Inside Shoes when she first walks into the scene, something which all the members miss. Likely the others were so relieved at seeing "Yui" after missing several days they weren't paying attention.
- In Natsume's Book of Friends, everyone does notice Natsume is acting strange when Nyank-sensei impersonates him but assumes he just wasn't feeling well. However, knowing his involvement with youkai, Tanuma does figure out it's not him and gets Sensei to reveal himself, much to Natsume's dismay.
- Happens in Gunsmith Cats when Becky is being held at gunpoint to lure Rally into an ambush over the phone. Rally realizes there's a serious problem when she notices she didn't send Becky her fee and Becky made no comment whatsoever.
- In the first episode of The Elysium Project, Ian figures out that the Jessica that he's talking to is actually Mirage when "she" accidentally gives away that she doesn't know about the rendezvous point that they had set up with the other escaped subjects.
- In Big Finish Doctor Who play Intrusion Countermeasures: The Reesinger Process, Dr Allison Williams and Group-Captain Ian Gilmore are undercover in the eponymous interrogation training program, which is actually hypnotising people. When Gilmore gets sent out as a hypnotised assassin, the guy running the place (who has got the idea they're an item) tells Allison he's resting but he says he loves her. Allison is taken aback by this but decides it's probably military code for "everything's fine".
- In a Spider-Man comic, Eddie "Venom" Brock's ex-wife (who is surrounded by police) addresses him as Edward over the phone. Displaying his typical lack of subtlety, Eddie immediately shouts "WHO'S WITH YOU?!"
- An early Fantastic Four story has Doctor Doom switching bodies with Reed Richards. It doesn't take long for the rest of the FF to find something off about "Reed" being arrogant and stand-offish. Reed attacks in Doom's body but Johnny and Ben have figured something is up. Johnny uses his flame to create the image of a stick of dynamite about to explode. Without hesitation, "Doom" throws himself onto dynamite to save the others while "Reed" instantly tries to escape. That's enough for the team to realize what's going on and capture Doom, causing him to switch back with Reed.
- In one episode of Flash Gordon, Dale distinguishes the real Flash from an impostor when the fake announces that he loves her. In a bit of a twist, Flash (the real one) is visibly troubled by this.
- Modesty Blaise:
- When captured by terrorists and forced to call Modesty, Willie addresses her by name instead of calling her "Princess". She immediately packs her bags and comes to his rescue.
- Modesty & Willie also repeatedly use a pre-arranged distress code throughout the series. If either of them drops the name "Jacqueline" into a communication, that's the cue to hit the panic button.
- They also use "Bertha" as code for "I need a distraction".
- Captured by the Mekon and forced to broadcast a message to Earth, Digby claims he's having such a nice time it reminds him of a holiday he once had. His aunt realises he's referring to an occasion when he was wrongfully arrested and that he and Dan Dare are being held against their will.
- In a Mickey Mouse story a famous opera singer suddenly not only abandons his contract but signs on for a rival — and refuses to see anyone. His former studio, not being idiots, finds this suspicious, but have no proof. When he releases a "greatest hits" collection, however, one word in each of the famous arias (all spoofs of real ones) is wrong — and the wrong words together spell out the location where he is held against his will. This trope truly enters when his ex-manager points out he would never miss a word like that.
- In Frank Miller's first issue of Daredevil, Elektra forces a Mook to phone his boss and set up a meeting (so she could capture him and collect his bounty). The mook suggests a time an hour later than previously planned, which was their codeword for trouble. His boss knew he was going to be walking into a trap.
- In one issue of Doom Patrol, Larry figured out that the putty-like Madame Rouge was impersonating the Chief when "he" called Rita Elasti-Girl — "the Chief would NEVER call Rita by that freak name!"
- Batgirl (Barbara Gordon) and Blue Beetle (Ted Kord) know each other well. A robot impersonates his voice, yet "Babs, fortunately, is no fool, and knows Ted far too well to fall for that shit."
- During the "Operation: Zero Tolerance" X-Men arc, Bastion is psychologically torturing Jubilee by forcing her to watch (faked) images of her fellow X-Men being tortured and killed. Jubilee seems about to break down until she hears "Wolverine" begging for mercy. At this point, Jubilee snaps out of it and laughs in Bastion's face, because she knows that Wolverine would never beg.
- A group of Skrulls disguise themselves as the Starjammers to attack the X-Men, betting the heroes will think their allies are under mind control and thus hold back. However, the Skrull impersonating Corsair gives them away when he gloats on how "these Earthers" aren't so tough.
Storm: An interesting choice of words. Considering the real Corsair was born on Earth and proud of it!
- As the title character and his lover/accomplice are Masters of Disguise, this tends to happen from time to time in Diabolik, as Diabolik doesn't always know everything. The funniest instance is when Diabolik replaced a Grumpy Old Man and a group of children recognized him because he wasn't grumpy enough.
- Darkly averted in The Transformers: Robots in Disguise. In the season one finale it's revealed that Prowl's apparent descent into villainy was actually a result of Megatron's Loyalists mind-controlling him. However none of the protagonists had figured this out beforehand; in other words, they thought him becoming a ruthless murderer was completely in-character. Once he's rescued, the realization that none of the Autobots actually trust him utterly breaks Prowl's heart, causing his Sanity Slippage to kick into high gear.
- Invoked in Clean Room and its version of demonic possession. One demon uses singsong repeated consonants that give away its presence in a host to the audience, if not the characters.
- In Nightwing (Rebirth) #27, Spyral have turned evil (again) and Nightwing and Huntress are facing a squad of agents led by Dick's old friend from Grayson, Tiger. Dick wants to find evidence this isn't what it looks like and jokingly says "He hasn't called me an idiot yet, are we sure it's really him?" At the end of the issue Nightwing finds Tiger standing over another, badly beaten Tiger, who manages to mutter "you ... idiot ..."
- Teen Titans Go!: In Issue #42, after the Teen Titans think they got all parts of Raven's personality back, Robin finds it odd "she didn't so much as frown at Beast Boy" for causing that mess in the first place. The Trigon-eyed Raven is still at large and shows a "the end?" sign.
- The Punisher MAX: In the final arc, Elektra calls the Kingpin to let him know she's killed Frank. Fisk, who knows she'd be a lot more elated at having killed the Punisher, instantly deduces Frank has a gun to her head and tells her to put him on.
- Ghostbusters: In the third issue of the "Mass Hysteria" arc, Peter takes a phone call for help while discussing the current problem with Walter Peck and immediately leaves via motorcycle without a word, much to Peck's surprise. Considering the caller was Dana Barrett, it's understandable.
Walter Peck: Ms. Melnitz, after taking that phone call, Peter Venkman ran out of here without a single smart-assed remark. That kind of character inconsistency is, in my experience, the reddest of red flags.
- Played with in Superior Spider-Man when Doctor Octopus takes over Peter Parker's body. A complaint of fans is how Spider-Man is suddenly speaking in a scholarly and arrogant manner without his usual wisecracks. He's also far more brutal in the field to the point of killing someone. Yet, all the Avengers and other heroes do is shrug that the man is just being rougher, not seeing his complete personality overhaul as something too suspicious.
- Lampshaded when, after getting his body back, Peter briefly acts like Octopus then says "wow, I spent months talking like that and no one noticed?"
- In Faith and Doubt, it's revealed that Chrysalis' poor impersonation of Princess Cadance was due to the Princess acting like Prince Blueblood when she was caught, hoping it would clue others in. Chrysalis falls for it, but it fails to alert Celestia, due to her immense blind spot for her family.
- The Twilight Child: Rarity notices something's up with Rainbow Dash when she starts enunciating properly. This is because Rainbow Dash has been on the receiving end of a "Freaky Friday" Flip.
- In Out Of The Dead Land, Steve tells Bucky that the thing that tipped him off to him having been replaced by a robot impostor was that the robot told Steve only what he wanted to hear whereas the real Bucky wouldn't have gone along with everything he wanted unless he was up to something. There's also a bit of Irony at work here, as the last thing the real Bucky told him before being kidnapped was that he wasn't Bucky (due to suffering from a brainwashing-induced identity crisis) but that Steve detected it as still more authentic than the false Bucky apologizing and telling Steve that he'd work harder to be Bucky.
- The "Setting the Curve" chapter of The Mysterious Case of Neelix's Lungs has the Voyager and Vetar crews hunting a Founder that got trapped in the Delta Quadrant with them. At the climax it tries to hide as ex-Maquis Voyager crewman Tahel Mizrahi, but Ayala identifies it because Mizrahi was born and raised an Orthodox Jew in Israel and hasn't used the word "Jesus" as an exclamation as long as he's known her.
- This Bites!:
- The Self-Insert character Cross outs Mr. 2 from his disguise by insulting Emporio Ivankov.
- Zeff realizes something's dreadfully wrong on the Secret Island when he hears Sanji refuse someone food. And that's just one of the alerts.
Zeff: Sanji... he would never say that. Not in a thousand years, not if his life depended on it, not if every woman in the world begged him to say it.
- Cross invokes this again: by convincing Iceburg and Franky that Robin has never wanted to revive the Ancient Weapons, they decide that they don't need to keep the Pluton's blueprints around anymore... forcing the two hidden CP9 agents to make a grab for the blueprints once Franky brings them out to burn them.
- Rosario Vampire: Brightest Darkness Act IV: The gang, especially Moka and Mizore, are able to tell right away that Felucia has been Brainwashed and Crazy by Hokuto when she constantly goes on rants about how Dark abandoned her to be regularly tortured, both physically and sexually, by Hokuto's Psycho Lesbian Co-Dragons, Jovian and Jacqueline; they know that the real Felucia has Undying Loyalty to Dark and would never lose faith in him.
- In Bring Me Back Home, Bridgette, while forced to impersonate her parallel universe counterpart Marinette, shocks Marinette's friends when she dismissively refers to Chat Noir as "like a sidekick" and not as important as Ladybug. This is something Marinette would never say, in or out of costume.
- Spoofed in Dragon Ball Z Abridged, where 18 is tipped off because Cell's impression of 17 is so Totally Radical that it's almost physically painful ("Yo shiggy-diggy, what's up my sizzle?")
Fake 17: So what you need to do is calm down and get all up in Cell! It's downright tubular in here! We got candy and puppies and
18: You know absolutely nothing about us, do you?
Cell: Okay. To be fair, I just met you.
- In the Sword Art Online fic Imprisoned Heart, Asuna's older brother Koichirou is able to tell right away that something's wrong because he knows that Asuna has always hated Sugou. Asuna sends him out to find Kirito, where he finds out that she's only consented to marry him because he's downloaded Yui onto a flash drive and blackmailing her and Kirito to keep quiet about his actions in ALO, or else he'll destroy Yui.
- Ice Age: Continental Drift: While Manny, Sid, Diego, and Granny are sailing over the night in Captain Gutt's stolen ship trying to return home, they encounter mythical sirens who hypnotize them by shapeshifting into the characters they are in love with (Ellie and Peaches in Manny's case; Shira in Diego's case; a gorgeous female sloth in Sid's case; and a hunk male sloth in Granny's case). Fortunately, Manny snaps out of it when the Ellie-shaped siren tells him he is always right which the real Ellie would never say and immedately changes the direction of the ship saving their skins at the last second.
- In the war film The Big Red One, some German soldiers are posing as Americans. They're found out when somebody notices that throughout their meal they hold the fork in the left hand and the knife in the right instead of cutting off a piece of meat then transferring the fork to the right hand to lift the food to their mouth.
- In The Bourne Ultimatum, when Nikki is in a room with Jason Bourne and asked to "code in" on the phone to her superiors. Her personnel record is shown on screen, with responses for "normal" and "under duress", but despite being in a potentially dangerous situation she gives the "normal" response. This was because she'd switched sides. However, her superiors figure out Bourne is there anyway and send troops in to get him, and both Bourne and Nikki know it, despite her giving the "normal" response.
- Bullshot (1983). The dastardly villain, Count Otto von Bruno, who speaks in a stereotypical Prussian accent, fakes the voice of Professor Fenton with Applied Phlebotinum. Despite a chronic malfunction which forces von Bruno to speak at a vastly sped-up rate, the Professor's dim-witted daughter doesn't suspect a thing when he says: "I want you the formula to London bring." Only our hero Bullshot Crummond realises instantly that you'd never hear a split infinitive from an Oxford man, and so it must be a trap!
- In Cops And Robbersons, Chevy Chase's character Norman is a huge fan of cop shows and has always dreamed of being a cop (except his ideas of what it means to be a cop come exclusively from TV). After the cops discover that a meeting between criminals is going to take place next door to his house, detectives Jake and Tony set up a stakeout in Norman's house, much to his delight. Jake is initially annoyed at Norman's assumptions about cops, especially when Norman interferes in Jack's duties. However, when the bad guys take Norman's family hostage, Norman calls his own house (not knowing the situation), and Jake tells him a message involving time. Norman is confused, but then looks up police codes and figures out that there's a hostage situation at his house. Unfortunately, instead of calling the police like Jake wanted, Norman decides to rescue them himself.
- In Die Hard with a Vengeance, a bunch of German mercenaries impersonate cops. Although the leader speaks English with a flawless American accent, he slips up on a few word choices, such as calling an elevator a "lift" and saying that it's raining "dogs and cats", instead of the usual "cats and dogs". When McClane recognizes that one of them is wearing a friend's badge, and mentions the lottery to figure out if anyone on the elevator is real. None of the fake cops know last night's numbers, though in the beginning it's established that every NYPD cop plays the lottery and knows exactly what the winning numbers were.
- In From Russia with Love, James Bond chastises himself for not recognising an enemy agent posing as a British gentleman spy when the man orders the wrong wine with a fish course at dinner. Unfortunately, Bond only realises this hideous faux pas after the enemy has him at gunpoint.
- In It Could Happen to You: When a cop walks into a local deli to get coffee, he asks where the owner's wife is. The owner tells him that she's out sick, but as he turns to get supplies we see that his wife is being held at gunpoint by a robber. Knowing that the cop can't see this, he then gives him the coffee for free. Sure enough, when the cop he goes outside to join his partner, he tells him that the man is being robbed — aside from the free coffee, having come to the store for years, they know that "that bitch would show up for work even if she were dead".
- In the second Lara Croft: Tomb Raider movie, Lara's butler tries to do this, but is rebuked for it. "Why are we even having this conversation?"
- In the second Miss Congeniality movie, Miss United States drops a big hint to her location by saying "My booty is on the line here." Sandra's character catches on and explains that "She would never refer to her butt as her booty... she would never refer to her butt as her butt! She calls it a po-po!" The kidnappers tie her and the celebrity pageant host into the sinking ship at Treasure Island in Las Vegas to passively kill them.
- Mortal Kombat: During the final showdown, Shang Tsung pulls a Shapeshifter Guilt Trip against Liu Kang by morphing into his brother Chan, who Shang Tsung had murdered. Though Liu knows it's not the real Chan (after all, Shang morphed right in front of him), he's still hesitant to attack until Shang!Chan says he forgives Liu for letting him die. Though Liu blames himself for Chan's death, he knows that Chan himself wouldn't... and hearing this gives him the right state of mind of who's really to blame:
Liu Kang: No....it wasn't my fault! Chan chose his own path...every man is responsible for his own destiny. Shang Tsung killed my brother!
- National Treasure 2: Book of Secrets:
- The trap is somewhat different. Mitch Wilkinson forces Emily Appleton to give her ex-husband a rather unconvincing fake translation of some Olmec hieroglyphs. He doesn't seem to pick up on her gestures, so she promptly texts her son Ben Gates the real translation.
- She also deliberately starts a fight with her ex-husband, mentioning a place seemingly from their past. Except it's a subtle historical reference that only her ex-husband and son (and her son's ex-girlfriend) could figure out.
- The film adaptation of Night of the Fox (1986) has Field Marshall Erwin Rommel meeting with generals plotting against Hitler. To give himself the perfect cover, Rommel enlists Erich Berger, a corporal who is a stunning lookalike to pose as Rommel for a visit to the Jersey Islands. Also there is Harry Martineau, an OSS agent posing as an SS officer on a secret assignment. Harry decides to kill "Rommel" to hurt the German war effort. He confronts him in private with Berger babbling he's not Rommel and even tearing his wig off. Harry just seems disappointed as "I expected better from you." He's about to pull the trigger when Berger starts praying...in Hebrew. It turns out the real Berger was killed in a bombing three years earlier and his body was found by Jewish actor Heini Baum. Seeing Berger's call-up papers in his pocket, Baum hit upon the idea that "what better place for a Jew to hide but in the German army?" He and Harry are thus able to use the Rommel masquerade to help each other out.
- No Man of Her Own: This happens constantly to Helen as she tries to pretend to be Patricia Harkness: she doesnt know Hugh's (Patricia's husband) favourite song, didnt know that Hugh had a brother (Bill), and signs her real name when trying out a pen out of habit. The Harkness family (who had never met or seen a picture of Patricia) think this is just a result of the train accident, but Bill is the only one that figures out that Patricia isnt really Patricia. But he doesnt care.
- In The One I Love, Ethan realizes that the Sophie he's talking to in the guest house isn't his actual wife when she cooks him bacon, because the real Sophie would never let him eat bacon. It's also what tips him off to the fact that the Sophie who escapes with him at the film's end isn't the real one.
- In The Ring Two "Aiden" refers to Rachel as "mommy", when he prefers to call his mom by name. This clues her in that he is being possessed.
- The Firefly movie, Serenity. Mal and Inara have a polite, awkward conversation by videophone, with Inara inviting Mal to visit her. Discussion with the rest of the crew ensues.
- In Sherlock Holmes: A Game of Shadows, after an action sequence that separates the pair, Mary is understandably confused when Watson sends her a letter saying he doesn't miss her and hopes to never see her again. Mycroft Holmes tells her the truth can be found from a code that he and Sherlock devised as children, where a notice would be taken at face value or as the complete opposite depending on if the first letter of the note was a consonant or a vowel; in this case, Watson's letter is of course the complete opposite of what he means. The letter needed to be coded in case it were intercepted by someone affiliated with Moriarty, who had just targeted Mary in his scheme just to spite Sherlock Holmes.
- In Sneakers, Crease draws Brice away from a meeting with the villains in a public meeting space after seeing a newspaper blurb mentioning that the mathematician they had stolen the MacGuffin from has been killed and realizing what their employers really are. He gets Brice to leave with him by holding up the carphone and shouting that it's his mother calling. Since Brice's mother would have no way of calling him, and one of their group has the nickname "Mother", it's a clear signal that he needs to get out of there.
- In The Stranger, Franz Kindler (Orson Welles) is an escaped Nazi war criminal living in the United States under a fake identity. He's at a dinner party that also includes Mr. Wilson, a war crimes investigator who suspects that Welles's character might be the missing Kindler. A casual discussion of the German character turns to Karl Marx, which leads Kindler to respond by saying "but Marx wasn't a German; Marx was a Jew." This causes Wilson to realize that "Charles Rankin" is in fact the man he's been hunting.
- In the movie Sudden Impact, when Harry gets his usual morning coffee, the café is being robbed; everyone is being forced to act naturally, but the waitress (knowing Harry's usual is "no sugar, no milk") adds lots of sugar. Harry, distracted by some case work he's going over, just pays and leaves with the cup. Outside, he takes a sip, spits it out and turns back to the diner.... then notices "patrons" locking the doors and turning the "Open/Closed" signs around, figures out what's up, and goes around to come in through the back.
- In Superman II, the Krypton criminals led by General Zod force their way into the White House. They enter the Oval Office, and ask the person sitting behind the desk to kneel before Zod, which he does without saying a word. Immediately, they decide that he is not the President, since someone with that high a rank would put up some resistance.
- In Surrogates Bruce Willis' character is tipped off that his partner's surrogate isn't being controlled by his actual partner when she refers to him by his last name. Everybody else in the movie does this, but she always called him Tom.
- Terminator 2: Judgment Day does this twice.
John: Something's wrong, she's never this nice.
- First when John tries to call his foster parents to warn them about the T-1000:
[the Terminator takes over]
The Terminator: [to John] What's the dog's name?
The Terminator: [in John's voice] Hey Janelle, what's wrong with Wolfie? I can hear him barking.
"Janelle": Wolfie's fine, honey, Wolfie's just fine. Where are you?
The Terminator: [hangs up the phone] Your foster parents are dead.
- It happens again when the T-1000 takes Sarah Connor's form and asks for help, something the real Sarah had previously berated her son for doing. The other Sarah instead tells John to get out of the way, something the T-1000 would not be inclined to tell his target. In the Director's Cut, however, John is tipped off when he sees his "mother's" foot melting into the floor.
- In Thor: The Dark World, a savvy viewer will realize early on that Loki's betrayal of Thor to the Dark Elves is an act. When doing so, he introduces himself as "Loki of Jotunheim". While he actually is a Jotun, he despises his birthplace and his birth parents, and whatever his issues with his adoptive family, he still considers himself to be Asgardian. Without that little hint, Loki's deception is extremely convincing.
- In Transcendence, Max quickly begins to suspect something's gone wrong with Will's upload when he's asking for access to financial and educational data almost immediately after he regains his sense of self. The Will he knows was never so proactive, which convinces him that this Will is just an echo superimposed over the PINN AI used as the base for his program. It turns out that Will's actions are entirely in-character, but now he has the means to achieve his goals instead of being content with limited gestures.
- In The World's End, Andy realises that Oliver has been replaced when Blank!Oliver doesn't react to a hated childhood nickname, or to to references about Gary having sex with Oliver's sister, Sam.
- X-Men Film Series:
- X-Men: For the audience at least, "Bobby Drake's" stern demeanour when he tells Rogue that she should go is at odds with his introduction as a Nice Guy. As it turns out, Mystique had impersonated him.
- X-Men: First Class: How kid Xavier pierces kid Raven's disguise at the beginning of the film. She looks like his mother, but acts nothing like her. He confirms it with telepathy.
- X-Men: Days of Future Past: Dr. Bolivar Trask's secretary is surprised when he compliments her scarf, which is something he doesn't normally do. We learn a few seconds later that "Trask" was actually Mystique, who hasn't quite mastered gender roles yet.
- Screamers. Colonel Hendricksson goes on a mission and discovers the Screamers have taken human form so they can infiltrate their bunkers. When he returns to his own command bunker he calls his Number Two on the radio, telling him to come out and meet him. A voice claiming to be the Number Two answers telling Hendricksson to come inside instead. Hendricksson then asks to speak to Don Giovanni (the opera music he was playing when his character was introduced). When the same voice claiming to be "Don Giovanni" answers, everyone runs like hell.
- In a nod to Star Trek, the Fighting Fantasy novel Starship Traveler has a part where you're captured by aliens and cloned, and the clone tries to impersonate you so the aliens can steal your ship. If you succeed on a roll, you can with great mental effort implant two things into the clone: an inability to lie, and the name of a certain sterile prison planet back in your own universe. When the clone tries to get your crew to beam down and get captured, he'll tell them that it's lovely down there, "as nice as [prison planet]".
- Animorphs: In "The Capture," when Jake is infested by a Yeerk. When Controller!Jake sees Ax, he's so overcome with Fantastic Racism that for a split second Jake's face shows unbridled hatred, which gets everyone suspicious. The deal is sealed when Ax tries to touch "Jake," causing him to scream "Get your hand off me, Andalite filth!"
- This actually continues a bit more, when the others force him to hide in an abandoned cabin until his Yeerk starves to death, with Ax planning to morph Jake around his family. As "Jake" continues to object, the others note that the real Jake would certainly be annoyed with this whole situation, but by now would be trying to coach Ax in how to act like him, lest his family figure out the truth.
- That particular Yeerk seems to be a Bad Liar; he was also Tom's original Yeerk, but acted so unlike him that it only took Marco one conversation to figure out that he was Not Himself.
- John Birmingham's Axis of Time: A temporally-displaced multinational fleet from 2021 and the US Pacific Fleet of 1941 have just engaged in battle by accident, and are trying to sort out the situation. One of the 1941 sailors volunteers to go over to the future fleet, and arranges a duress signal with his superiors by suggesting "My sainted mother taught me never to swear, so if anything is wrong, I could slip in a fucking profanity, sir."
- In The Bet's On, Lizzie Bingman, the titular character is kidnapped because she witnessed a murder. While she's leaving with the murderer she manages to alert her friend because she mentions her sisters: Lizzie only had brothers.
- Detective Elijah Baley is informed that his wife Jessie is a member of a criminal organization in The Cavesof Steel. He knows it is a lie because her name is given as Jezebel, a name she never uses.
- Agatha Christie:
- In the short story "The Adventure of the Sinister Stranger" uses a Homage to the now-obscure Oakwood Brothers stories by Valentine Williams. When Tommy announces he is going to "walk into a trap with my eyes open", Tuppence says that this is exactly what happens in the stories when Desmond Oakwood blunders into something and needs Francis to rescue him. Tommy subsequently signs a letter asking Tuppence to return to the agency "Francis", to signal that he's done precisely that.
- In The Secret Adversary, Tommy realises that a message sent to him from Tuppence is not actually from her, as it is signed "Twopence".
- Even worse, only one Character hasn't seen her name spelled out so Tommy immediately figures out who the mastermind is (with the help of the other suspect he now knows is innocent)
- Also used in the novel The Man in the Brown Suit. After Anne is lured into a trap by a note allegedly sent by Harry, she and Harry decide that in all future written communication, they will only refer to each other by pseudonyms. Later, Anne is kidnapped and forced to write Harry a note which will lead him into a trap. When she signs it with her real name instead of the agreed-upon pseudonym, Harry recognizes that the note is a fake and that Anne is in trouble.
- This also shows up in "The Flock of Geryon," one of the twelve short stories in The Labours of Hercules. The "flock" of the title is a religious cult that has been connected to the deaths of three elderly ladies; Hercule Poirot teams up with Amy Carnaby, an easily flustered but brave middle-aged woman, to solve the crime. Mrs. Carnaby infiltrates the cult and later meets Poirot for tea; at the end of the meal, she abruptly stands up and announces that she is giving up on their plan, as she has become completely devoted to "the Master" and would do anything for him. Poirot immediately realizes that something is wrong, as Mrs. Carnaby openly stated her utter disdain for the cult at the beginning of the story. It turns out that she recognized that the cult's caretaker was secretly eavesdropping on their conversation from the next table, and she quickly improvised the speech to alert Poirot.
- Another short story about a woman who realizes her husband is a serial murderer sees her using a phone to call a local friend for help. As her husband is sitting in the next room, she pretends to be calling in an order to the butcher's. She holds the conversation, but only presses down on the phone's receiver switch (which makes the other person hear what she's saying) when relaying information about her situation (e.g. "I need four pork chops"—press—"it's VERY IMPORTANT"—release—"we're having company tomorrow, so it's almost"—press—"a matter of LIFE AND DEATH..."). The woman's husband is slightly suspicious, but she allays his fear by claiming that she was just being melodramatic to get results.
- In the Alistair Maclean spy novel The Dark Crusader (also known as The Black Shrike) the hero includes the nonsense word 'Bilex' in all communications with headquarters, to show that he is not sending under duress. When he is captured, the bad guys tell him that they have sent a message assuring HQ that all is well. At the end of the book he realises that either this message (minus the safety word) was never sent or it was ignored by his superior. Either way, it proved that the superior was actually in league with the bad guys.
- In A Darker Shade of Magic, a villain tries to get the drop on Kell by magically disguising herself as Lila, only for Kell to immediately stab her. He later tells Lila he knew it wasn't really her because the villain used the word "please".
- Discworld: While Magrat is hiding from vampires in Carpe Jugulum, "Nanny Ogg" speaks to her through the keyhole... and Magrat asks her to tell a particular dirty joke. The voice hesitates and says that now isn't the time, which alerts Magrat that it's really one of the vampires — so when the vampire tries to come through as steam, it winds up in a jar full of lemons.
- The Dresden Files: In Blood Rites, after the two of them are captured by the Big Bad, Lord Raith, Murphy calls Harry "Mister Dresden". Raith dismisses it without a second thought, but Harry immediately picks up on it as her intentionally playing up being helpless, as it went against both the nature of their friendship and her strong, assertive personality.
- In Ender's Game, Ender gets a message that really was written by his sister Val, but he figures out that something is off about it because of how aggressively she inserts personal anecdotes and jokes into the letter in an apparent attempt to prove that it's really her. Ender correctly guesses that she would be much more subtle, so the military must have told her to write it.
- The Famous Five:
- Georgina "George" Kirrin in the first novel is ordered to send a note to two of the gang (another is with her) by some smugglers. She signs it "Georgina", which she would never call herself and gets highly offended when called that.
- Again with another Enid Blyton story: in "Five Find Outers and Dog" Frederick Algernon "Fatty" Trottville is made to sign a letter by people holding him hostage. He is forced to sign as "Freddie" which makes Bets and them all suspicious.
- In Fearless, there's a Story Arc where Gaia is being forced to humiliate Ed Fargo. He asks her "You're enjoying this aren't you?" and Gaia answers, "Yes, I like torturing you. Almost as much as I like Lox." In this case, she's doing it deliberately as a secret code (she'd told Ed earlier in the book that she hated Lox).
- Several characters in Frederick Forsyth books use this when communicating from behind enemy lines. One trick is to always include a line of very slightly misquoted poetry — if a poem's quote is correct, it means he is operating under duress.
- In Gaunt's Ghosts, the resistance on Chaos-occupied Geron respond to the code phrase "Geron survives" with "Despite their efforts" normally, while under duress they say "Even though it dies."
- In Green Rider, a man hides a crucial message in a love letter. He's killed before he can deliver it, but the protagonist, Karigan, passes on the love letter to the messenger's girlfriend. When she gets the letter, she spots some inconsistent details (he misstates the color of her hair; he mentions a brother when he doesn't have one) and mentions it to Karigan, who realizes that the letter contains a coded message.
- In Diane Duane and Peter Morwood's High Moon, the bad guys fake a message from the protagonists' superior officer to get them out of the way. They're briefly deceived, but then notice that it's signed in a nonstandard way, the routing makes no sense, and most importantly that this message from their cost-focused boss doesn't say a thing about the expensive reward they just authorized.
- Honor Harrington: Towards the end of On Basilisk Station, Honor begins to suspect something fishy going on with a Havenite flagged freighter, the Sirius, that's been orbiting Basilisk since she got there. It's ostensibly waiting for parts for its Warshawski Sails, but Honor's crew notice its impeller nodes are active, and have been the entire time, meaning it could quickly bring up its impellers and get under way, but would also increase wear on the nodes themselves, not something a freighter captain would normally do, but it is something a warship captain might do. Sirius turns out to be a Q-ship, a warship disguised as a freighter.
- Lieutenant Eve Dallas from the In Death series hates being affectionate with her husband in public, especially when she's working. She never uses pet names or overly flowery talk, so when she does, it's her way of telling her husband Roarke something's wrong. Used most recently in Obsession in Death:
Eve: So you broke my clever code?
Roarke: "Later, honey?" I should say.
- In the Jack Reacher novel Tripwire, his girlfriend has been captured and been ordered to lure him into a trap. She calls him up and opens the conversation with "Hi, Jack". The point is that the main character is always called Reacher, by everyone including his mother when he was very young, and no one ever uses his first name. The coincidence of "Hi, Jack" and "hijack" only makes it more convincing that this is indeed a trap.
- In Jennifer the Jerk Is Missing, there is an unusual variant of this. To find out if Jennifer-the-Jerk Smith made it to camp or was kidnapped before reaching it, the protagonist, Amy, calls the camp to see if Jennifer Smith arrived. She's told that yes, Jennifer Smith did indeed arrive, and she's a very pleasant and charming girl. Malcolm, the kid who suspected the kidnapping in the first place, immediately recognizes that Jennifer-the-Jerk Smith is neither pleasant nor charming, and therefore the girl that arrived couldn't have been her. (She wasn't)
- In the Joe Pickett novel In Plain Sight, Sheridan does this after she and her sister Lucy are kidnapped and she is forced to call her mother to say that she and Lucy are going to a friend's place after school. She does so by saying that Lucy can't talk because her mouth is full because she is eating her lunch early as she always does (Lucy refuses to eat and usually brings most of her lunch home with her) and that she is calling on her cell phone (Sheridan doesn't have a cell phone).
- In the second Lady Grace mystery, Lady Sarah is abducted by a sea captain, and alerts Grace — or anyone — who can help with a message passed by a commoner that she sends her love to "Lady Jane, my dearest friend". The two young women hate each other with a passion, and so Grace and Masu are off to the rescue in a trice.
- Lemony Snicket: The Unauthorized Autobiography features a long and poignant letter written by the Duchess R to Lemony Snicket. He immediately lambasts the numerous errors she would never have made. Or, errors she might have made as a coded signal that all was not well. Or, errors she might have made due to disruptions in her training which were caused by constant moving of the V.F.D. Headquarters.
- In the Lionboy series, the main character knows his parents are in trouble because their letter to him is written the way an adult talks to a child, while his parents always talk to him like he was older. He and his parents use this in all their communications throughout the series.
- In one Maximum Ride book, a clone of Max tries to take her place. The kids realize something is up when she offers to cook (as Max is a Lethal Chef and leaves the cooking to Iggy), and when she expresses surprise that Iggy would know his way around considering that he's blind. Of course, Angel can read minds, too, which the clone has no clue of, so she knew right away.
- In a Nancy Drew book, a young woman on the phone with Nancy asks her to "tell Ned I'll see him at the big rally on Monday". There is no rally on Monday — the girl is trying to tell Nancy and Ned that she's in trouble. Unfortunately, Nancy doesn't realize this and thinks the girl is trying to say she's okay, and as such, doesn't relay the message to Ned...
- One of these is part of what kicks off the plot in Reconstructing Amelia. The official report of the titular Amelia's death is that she was caught cheating on an English paper by submitting a plagiarized paper from the Internet, which spurned her into an impulsive suicide. Her mother Kate, however, never quite buys into this story, despite a lot of the evidence pointing that way, because Amelia would never cheat — especially not on an English paper. When she receives an anonymous text telling her Amelia didn't actually kill herself, she begins investigating her daughter's death. She's right — Amelia was actually pushed, and the so-called cheating was actually a Frame-Up. Kate finds her real paper and uses it to clear Amelia's name.
- In the Tom Clancy/Larry Bond novel Red Storm Rising, Air Force weatherman Mike Edwards, stranded on occupied Iceland and radioing NATO everything he sees, is given a Duress Code. Played with in that he nearly says it by mistake. (If captured and made to phone in phony reports, he is supposed to preface the message with "Beagle Calling Doghouse, things are going great.)
- In the Op Center novel Games of State, a character is forced to send a message back to their Mission Control as part of the villains' plan. As is explained later, he had a pre-existing arrangement where every message he sent would include either a smiley facenote or a frownie facenote depending on whether he was fine or under duress. In this case, it is treated as a characteristic bit of paranoia that had eventually paid off, rather than anything that an agent would normally do.
- In the Rugrats novel Prince Chuckie, Tommy and the other Rugrats are able to determine that Chuckie has been swapped with a young prince who looks exactly like him when they realize that he's doing things that Chuckie would never do, as well as the fact that he's lacking the scars that Chuckie had received prior to the novel.
- A Series of Unfortunate Events presents a written variant in the third book. The trio's Grammar Nazi auntie leaves them what looked like a suicide note, but was filled with mistakes, leading them to deduce that it was written under duress and contained some hidden message. Which it did: the letters involved in the misspelled and malformed words spelled out where she was actually hiding.
- In the science fiction novel Sewer, Gas & Electric, one of the main characters (a parody of Ayn Rand's heroes) is forced to play a twisted computer game against a robot double of himself, with his parents' lives at stake. When his ex-girlfriend charges in with a gun to rescue him, the fake jumped up and acted relieved, whereupon she gunned it down. The real one was so absorbed in the game that he didn't even notice any of this until several turns later, when he realized his opponent hadn't made any moves.
- Star Wars Legends:
- In Han Solo's Revenge when Han and Chewie were to make a smuggling drop, if during the meeting Han did not try and signal Chewie (who was overseeing the proceedings back in the cockpit of the Falcon) then something had gone wrong with the drop.
- In one of the Wraith Squadron books, Face, undercover as a stormtrooper so as to steal TIE fighters for their pirate facade, has to speak the password to the supervisor (because the on-duty officer who knows the password can't say it or it would reveal something was wrong, and the one who was supposed to say it was killed during the break-in). He gets away with it thanks to his acting skills and the static disguising his voice...until he makes the mistake of referring (out of habit) to the TIE fighters as "eyeballs" (New Republic slang). He tries to salvage it by claiming it was a joke, to no avail.
- Time Machine Series: The Mystery of Atlantis: If you try and tell a suspicious Athens city guard that you are a Scyth, he will promptly quiz you on a piece of Scythian culture (since he is a Scyth himself.) You fail ("What does a Scyth warrior keep tied to his horse's bridle?" No, not flowers. The scalps of his enemies), at which point he decides you're a runaway slave.
- Vorkosigan Saga: In Mirror Dance, Bel Thorne suspects that the "Admiral Naismith" who just boarded the ship is really Mark and not Miles, and confirms it by referring to Mark as Miles's clone in conversation. The real Miles always refers to Mark as his brother and corrects anyone who says otherwise, but Mark doesn't know this and lets it slide.
- In Dorothy Eden's mystery novel Waiting for Willa, Grace travels from the U.S. to Sweden to help her cousin Willa when the latter sends a message signed with her given name, Wilhelmina. Not only does Willa hate her given name and usually refuse to use it, but also the signature is a danger signal she and Grace had worked out some time before. When the kidnapped Willa's captors make her send another message to Grace, assuring Grace that she's all right, Willa signs the second message "Wilhelmina" as well. This makes Grace even more suspicious.
- In Wayside School Gets a Little Stranger, the students' voices are stolen by evil substitute teacher Mr. Gorf; when the lunch lady asks how the class is doing from outside the door, Mr. Gorf tries to trick her by using the voices of the students to say that everything is okay. The lunch lady figures out something is wrong, though, when the voice of the meanest student in the class says "Have a nice day!" This ends up being a parody, as not only does she figure out that something is wrong from this, she somehow figures out exactly what inconceivably bizarre trouble they're in (that a three-nostrilled man was sucking their voices into his nose) and how to save the day. Just from someone being out of character.
- In World War Z the Chinese doctor who encountered one of the first victims of the zombie plague had a friend working in the government. This friend was an eternal pessimist; no matter the situation, he'd always assume it was going to get worse. When the doctor tells his friend about the victim over the phone the friend says, "Don't worry. Everything's going to be all right." That's when the doctor knew that things were really bad.
- In a A Certain Magical Index crossover novella, an evil "shadow" of Kyousuke Shiroyama summons the White Queen to fight alongside him. The real Kyousuke hates her, and goes to great lengths to avoid her getting involved in his life.
- In Worm, one of these acts as a Wham Line in Chapter 14.8, when Bonesaw is pretending to be Tattletale in order to gain Skitter's trust.
- In Dungeon And Dragons third edition, the Sense Motive skill can be used to notice when someone familiar is under the effect of an enchantment. With subtle enchantments (which the subject may not even be aware of), the difficulty is rather high; however with Dominate effects, which drastically reduce the range of actions of the victim, the check is much easier.
- Super Robot Wars:
- Original Generation'' subverts this. When a main character's girlfriend disappears and later reappears, the character remarks that it's not her, because "even she wouldn't be silly at a time like this". When they break the mind control, she acts just like she did when she was mind-controlled. Another character mutters "Would never act like this in this situation, huh?".
- During the attack on the Omega Missile base in Super Robot Wars Compact 3, Folka then attacks Fernando and demands to know what is wrong with Fernando since Fernando isn't usually this kill happy but Fernando says what's wrong with that, all Shura are born to fight and kill and strive for the position of General. Folka wonders what changed Fernando like this but Fernando tells him to shut up and fight and die. After beating him, Fernando then says, "What a redundant moron" which perks Folka's ear and Folka says that he won't be hesitant anymore, he'll defeat Fernando and Fernando says that Folka can try. Folka then smirks and says "How about revealing your true face... You can't fool my eyes." "Fernando" then asks how Folka knew that he wasn't really Fernando and Folka says that he hasn't forgotten Fernando's fist (The way of the martial arts, fighter recognize, communicate, etc with their fist) "Fernando" reveals himself to be Arco who says that he didn't think Folka had gotten this strong and Folka says that the power of belief has made him stronger. Arco then says that when the REAL Fernando awakens then Folka wouldn't be talking big like this and Arco notes that this is it for him, looks like what that girl said was true.
- In Team Fortress 2, while the Spy's disguise looks and sounds perfectly like whomever he's disguised as, there are many ways a seasoned player can detect a Spy by just looking at their behavior. For example, a Spy disguised as a Scout appears to move unnaturally slowly, since he's the only class that moves faster than 107% of base speed, the upper limit of how fast the Spy can move.
- Another sign is if a Medic isn't healing people obsessively to build his Ubercharge up: if a Medic is walking around with his syringe gun out, you may be dealing with either an amateur Spy or a Battle Medic.
- There are also some voice lines that are wired to only play if you're on the attacking/defending team: if you're defending, and someone on your team says something along the lines of needing to push the bomb when the cart is rolling back, he's definitely a Spy.
- There is no way for the Pyro to be set on fire due to his flame-retardant suit. Thus, if a burning Pyro is running amok, he is certainly a Spy.
- In Marvel Ultimate Alliance, Doctor Doom's henchmen get "Dum Dum" Dugan to come to the S.H.I.E.L.D. Omega Base by relaying a Distress Call. However, Nick Fury figures out it is a trap when Dugan (purposefully) lists Bruce Banner as being a scientist researching the Super Soldier Serum when he is in fact assigned to the Gamma Bomb project.
- In Star Control II, when you meet the final remaining Shofixti warrior, his sensors are nonfunctional and he assumes that you are an Ur-Quan destroyer sent to hunt him down. The only way to convince him that you are friendly, counterintuitively, is to insult him repeatedly. The Ur-Quan, for all their faults, are always very polite, even when preparing to kill an enemy. Eventually he realizes this and accepts that you are not an Ur-Quan.
- In The King of Fighters, for all of her massive flaws Rose Berstein loves her older brother Adel and always tells him what's on her mind. When Adel finds out that she has become the new host for the KOF tournament and has built a whole new and lavish stadium for it behind his back, he's extremely disturbed and thinks something's very wrong. He's right: Rose has been brainwashed by Those of the Past and is their Unwitting Pawn.
- The last mission of the second week in The World Ends with You is ever-so-slightly inconsistent with the missions issued earlier in the week, as this one did not have any math-related puns in the message. Neku and Joshua notice this, but as it's still an official mission and the alternative is being erased, they do it anyway. Turns out it wasn't issued by the Game Master, but by the Conductor, who had decided the GM had gone rogue and needed to be eliminated.
- One comes up in Tales of Symphonia's sequel, Dawn of the New World; when Emil, Marta and Zelos come across two Lloyd Irvings fighting, both Lloyds urge them to believe they are the real Lloyd and to strike down the other. The player is given the choice to decide who is the real Lloyd after hearing each one give their speech. The fake is the Lloyd who declared the fight was for justice, which is something the real Lloyd has vehemently said in the original Tales of Symphonia was a word he hated.
- In a tidbit of Irelia's backstory in League of Legends, it's revealed that her test to become a champion involved a simulated battle with her father, a legendary swordsman known for feats such as staying dry on a rooftop during a rainstorm. Despite being terribly outmatched, she quickly realizes the deception when her brother swings in from the side and manages to land a blow, and promptly impales the illusion with her blade.
- In Castlevania: Symphony of the Night, Alucard comes across a scene of his human mother. He quickly becomes emotional and promises to save her. Then his mother starts saying hateful things against human beings, something his real mother would never say. Then it's revealed that the whole thing was an illusion set up by a powerful Succubus. Alucard isn't pleased.
- Subverted in Fire Emblem Fates. In the Birthright and Revelation paths, the party stops in the country of Izumo, and are greeted by its leader, Lord Izana. Izana acts like a cross between a party animal and a rich kid, which Hinoka takes as a sign that he's an imposter. And indeed, he was replaced by the Nohrian mage and Master of Illusion Zola. But when the real Izana is freed, that's exactly how he acts.
Sakura: I-Is this still Zola?
Hinoka: No, but I think we may have underestimated Zola's impersonation.
- In Emperor: Rise of the Middle Kingdom, spies disguise themselves as regular citizens but don't follow the walking pattern of that citizen type, making them easy to catch when they bypass roadblocks or show up in the wrong city district — assuming they don't just skip their research and dress as a worker from an industry your city doesn't have.
- In Final Fantasy VIII, Squall realizes that Edea is, despite all appearances, not the same woman who raised him when she calls Seifer, another of her former foster children, "worthless" after he failed to defend her. It soon turns out Squall's right. Edea is being possessed by the sorceress Ultimecea.
- In Paper Mario: Color Splash, entering the final level shows Peach drained from all of her colors and hung in a frame on Bowser's Castle walls. This will probably hint the player that the black paint plaguing Prism Island, with which Bowser was drenched through the game, has a mind of its own and Mind Controls the Koopa King: after all, doing something this cruel to her is very un-Bowseresque.
- Fleuret Blanc provides an example of someone else setting up a person as out-of-character rather than acting out-of-character themselves: Junior tries to deflect blame for the anonymous text messages by pinning it on Le Neuvieme — but the messages are in English, and Le Neuvieme only speaks French. This allows you to figure out the real culprit.
- Phoenix Wright: Ace Attorney - Trials & Tribulations:
- Phoenix thinks this trope is in play in the first case when Dahlia starts acting all-around bitchy. After Mia revealed Dahlia to be a major Bitch in Sheep's Clothing, who only dated Phoenix to get a certain poison-filled necklace and tried to kill him when seduction failed, she didn't feel the need to pretend anymore. Phoenix, however, is still crazy in love with "Dollie" and, after the trial, claims that this Dahlia was a fake. In a way he's right. The girl he actually dated at the time was Dahlia's twin sister Iris, who really was a Nice Girl.
- When Iris starts acting like an Extreme Doormat and makes some Innocently Insensitive comments, it's a clue that Dahlia is impersonating her. Phoenix does notice that something's off, but since he met said person just two days earlier (or rather he thinks he did), he doesn't connect the dots immediately.
- A Nodwick strip details a dungeon crawl where the group finds a high-up switch. The group is tipped off that something is amiss (viz. he's been replaced by a doppelganger) when Yeagar, looking for something to throw at it, ignores Nodwick in favor of a rock lying at his feet.
- In Questionable Content, Faye and her Crazy-Prepared mother have worked out a code phrase for when Faye was being held against her will.
Faye: No mother, the peaches are definitely not ripe.
- The Order of the Stick:
- Belkar... uh... subverts? (double-subverts? parodies?) this during the aftermath of a fight with the thieves guild. Celia and Hayley interpret it as Belkar gone... well, more insane than usual, since "usual" means "kill everything not allied to me."
Belkar: Let's stop the violence. [big grin]
Hank: There, see? Even your other party member agrees which means—
Celia & Haley: [together] RUN FOR YOUR LIVES!
- Later, Tarquin figures out that Elan is not Nale partly because Elan surrendered to save a teammate, which Nale would never do.
Tarquin: Plus, he didn't rant about his intellectual superiority even ONCE.
Malack: Now that you mention it, I did find that odd.
- During their parents' remarriage, Elan tells Nale not to object or cause trouble, which Nale calmly agrees to. This is the first step to make Elan realize he's in a Lotus-Eater Machine.
Nale: Did you ever think that maybe I'm tired of fighting, and that I just want to enjoy one day with my family?
Elan: No, that—that's not how you would react to this. That's how I would want you to react. At the very least, you should be trying to kill me for being chosen Best Man over you!
- Later in the story, when the High Priest of Hel casts Control Weather, Belkar seizes on this as proof that he is not Durkon, as Durkon wouldn't think of preparing the spell, much less use it to stop a storm. He could simply pray to Thor, Durkon's patron. Unfortunately, no-one believes him.
- The High Priest of Hel finally makes a serious error in trying to do a Breaking Speech on Roy by bringing up his inability to save his baby brother. That makes Roy realize this creature is in no way Durkon at all.
- Belkar... uh... subverts? (double-subverts? parodies?) this during the aftermath of a fight with the thieves guild. Celia and Hayley interpret it as Belkar gone... well, more insane than usual, since "usual" means "kill everything not allied to me."
- Played with in Terror Island. In this strip, the protagonists recognize that their friend Jame is possessed by a demon, when he says "SOUNDS LIKE SOMEBODY HAS BEEN EATING SOUR GRAPES." But when the demon is banished from Jame, he says exactly the same thing, and Sid proclaims "That's our Jame!" Unless it's because demons simply talk with different Speech Bubbles...
- Girl Genius:
- In Othar Trygvassen's(Gentleman Adventurer) twitter:
"That letter is a fraud! Othar Tryggvassen may do things that lesser men find objectionable or slightly illegal, but I never apologize!"
- In the comic, how does Dimo know that someone besides the Jager generals is present when he goes to report in to them? "... schmelled soap."
- In Othar Trygvassen's(Gentleman Adventurer) twitter:
- In Something*Positive, Eva had an Internet romance with someone who claimed to be Davan. Davan's friend Josh, however, was suspicious, partially because the e-mails all had perfect spelling, something Davan apparently doesn't bother with. Unfortunately for Eva, she didn't listen.
- In Exiern Neils tries to drop hints here that he has been be-spelled and is no longer fully in control of his own actions by calling Crown Princess Peonie the "Second in Line to the Throne" instead of the first. It seems like no-one notices at the time though. Peonie had to have it spelled out to her after the inevitable kidnapping, but her father was just going along with it 'til he could get his other assets in play.
- In El Goonish Shive, Mr. Tensaided interprets a hug from Susan as this. However, its actually a non-canon strip and Susan is voluntarily under a spell which has a mental effect that makes one be more relaxed about physical contact and less Terrified of Germs. Therefore, as Dan says in The Rant, Susan is "acting out of character in a very in-character way".
- In the Whateley Universe story "Test Tube Babies", team superboy Lancer is fighting a power mimic/shapeshifter who now looks like Lancer. One of them yells at a teammate with an anti-brick weapon to 'shoot both of us'. The teammate blasts that one senseless. Not only is the teammate savvy, but they have communicators they would really use instead.
- One episode of Atop the Fourth Wall has 90s Kid suggesting a Nirvana reunion that involves digging up Kurt Cobain's body and having zombie chicks play him like a puppet. It isn't until later, but it finally dawns on Linkara that not even 90s Kid is that twisted, leading him to realize he's been possessed by The Entity
- In To Boldly Flee, The Nostalgia Chick and Oancitizen infiltrate Zod's ship disguised as his old friends, Ursa and Non. Unfortunately, Non is mute, and Oancitizen can't resist talking. And he really can't resist singing...
- During the first episode of the Yellow Temperance mini-arc in Vaguely Recalling JoJo, Jotaro realizes that Kakyoin is a fake after witnessing Kakyoin in the act of devouring some beetles. Jotaro punches the fake Kakyoin in the face, which gets him to reveal himself as Rubber Soul. This is pretty much what happened in the arc it's parodying, oddly enough. It helped that Rubber Soul is a jackass who doesn't bother trying to mimic his target; he likes making them look like sudden assholes.
- In No Evil, Ichabod and Paula reach Kitty's house late at night and find that she appears to have stopped in the middle of canning some pumpkins and not cleaned up. Ichabod is dismissive of Kitty's "carelessness"; Paula instantly realises that there's no way Kitty would have left in the middle of a task of her own free will, and starts looking for evidence of whoever abducted her. Cue a late-night visit to Mictlan Wood, where Paula punches her way through rather a lot of undead.
- Subverted in American Dad!. Francine is threatening Stan with a gun for trying to ditch her at her high school reunion with his CIA body double, Bill. One of them gives a heartfelt speech about how he was selfishly putting her down while trying to make up for his past inadequacies. Francine determines that the real Stan would never say something so sincere and shoots the opposite who, reverting to his Southern accent, turns out to be Bill the double, after all. Stan really was apologizing.
- In Aqua Teen Hunger Force a (very degraded) clone of Shake was caught when Frylock suggested they give blood.
Frylock: The real Master Shake thinks the blood drive is a pyramid scheme. Perpetrated by Dracula and his night slaves.
- The best way to free someone of Purple Man's control in The Avengers: Earth's Mightiest Heroes! is to point out to the victim that they themselves are doing or saying something they would never do. Cap is freed by pointing out that he doesn't believe in forcing things on others; Hawkeye is freed by pointing out that Hawkeye never blindly obeys anyone, not even his superiors; Ms. Marvel is freed when it's pointed out that she'd never carelessly ignore her allies in distress, etc.
- Batman: The Animated Series:
- In "The Mechanic", the daughter of the mechanic who works on the Batmobile is kidnapped. With the bad guys listening in, Batman asks where she is, and the mechanic responds that she's "in the basement", which is apparently racetrack slang for in big trouble.
- In "Mudslide", a young security guard caught what he thought was a thief stealing his boss' safe, until he saw his boss telling him to get back to his post. The guard was about to leave when he noticed his boss's accent is gone and remembered he was on vacation in Hawaii. The "boss" knocked him out by throwing clay at him.
- In "Knight Time", Superman arrives in Gotham, as Batman has gone missing. During the investigation, Robin shows a video message of Bruce Wayne calling Lucius Fox about going away for a while. When Supes asks what's wrong with it, Robin points out that Bruce chuckles at the end. Bruce Wayne never smiles, much less laughs. Turns out he's under Brainiac's mind control, but not because he's Batman (which Brainiac doesn't know) but because he needs access to Wayne Enterprises resources.
- In an episode of Batman Beyond, Bruce realizes that his "inner voice" isn't really his, that he's under suggestion by the villain Shriek:
Bruce: The voice kept calling me "Bruce". In my mind, that's not what I call myself.
Terry: What do you call yourself? [Bruce gives him a pointed look] Oh, yeah. I suppose you would. (in Batman voice) But that's my name now.
Bruce: Tell that to my subconscious.
- In the Ben 10 episode "Perfect Day", Ben is trapped in a Lotus-Eater Machine by the Forever Knights where he is seen having "the best day ever". He then encounters a dream version of Vilgax who is completely out of character, as he only tried to send Ben to the Null Void and wasn't even after the Omnitrix. Ben didn't notice this until it was pointed out by the real Gwen (who, along with Grampa Max, entered the dream world to rescue Ben using special helmets from the Rust Bucket).
- Code Lyoko:
- XANA traps the team (except Jérémie) in a virtual version of the real world. Jérémie enters Lyoko to rescue his friends, and is confronted by an evil, virtual version of himself. Each tries to convince Odd, Ulrich, and Yumi that they are the real one. Evil Jérémie gives himself away when he says he would "never go into Lyoko", but they know that the real Jérémie WOULD go into Lyoko if it meant rescuing his friends.
- XANA sends a polymorph clone to manipulate the Lyoko-Warriors by using their feelings against each other. At one point, the clone, while impersonating Jérémie, kisses Aelita to prove he is the real Jérémie, which ironically fails since she knew the real Jérémie was too shy to ever dare do it. Later in the same episode, Odd is facing the real Yumi and the clone in Yumi's form at the same time, and actually recognizes which one is real when the real Yumi insults him, because "XANA respects him too much to insult him."
- XANA is pretending to be Franz Hopper. He gives himself away when he calls the Skidbladnir an odd name for a ship, when the real Franz Hopper was well-versed in Norse Mythology.
- Codename: Kids Next Door:
- There's a parody that then switches to being played straight. In the "Operation: P.O.O.L." episode, all of Numbuh Four's friends get replaced by doubles from a negative universe. He doesn't catch on at first, even when negative Numbuh One is acting wildly out of character, being cowardly to Lizzie and even revealing some of the evil plan. That's the "parody" part. The "playing straight" part comes into play because Numbuh Four does eventually figure out the switch... because of negative Numbuh Three's slip-up, not negative Numbuh One's. Specifically, negative Numbuh Three has a mean and nasty look in her eyes, which Numbuh Four knows, as her friend, is something that would never happen with the real, sweet-hearted Numbuh Three (even when Numbuh Three gets angry it's out of hurt feelings and not cruelty). Ergo, Numbuh Four correctly concludes, they must be from a negative universe or something! In the same episode, Numbuh One realizes his girlfriend is an impostor using the same method.
- When Numbuh One is trapped in a Lotus-Eater Machine, he sees through the ruse when he notices Numbuh Four swimming in a pool. The real Numbuh Four can't swim.
- In the Darkwing Duck episode "Battle of the Brain Teasers", Launchpad initially doesn't believe Gosalyn when she informs him that hat-shaped aliens that have taken over the bodies of Drake Mallard and Honker, even after seeing them with the hats. It's not until the hat that's taken over Drake has him change into his Darkwing Duck outfit — without his regular hat — that Launchpad becomes convinced, because the hat-shaped alien doesn't match the outfit and "DW would never wear a hat that clashes with the rest of his outfit".
- Averted on the Family Guy episode "And Then There Were Fewer". Lois is being held at gunpoint by Diane Simmons, and she tries to signal to Peter that something is wrong by calling him "Pete" (something she never does), while Peter does question it, he quickly ignores it and leaves so he can listen to music in the car.
- This was how Cosgrove discredited an evil clone in Freakazoid!: he asked if the clone wanted to go to a Yakov Smirnov festival. The clone said "no". (Compare that to Freakazoid's usual "DO I!")
- In the Futurama episode "Law and Oracle", Fry is able to tell that Pickles is deceiving him when he shows Bender sharing strong malt liquor with the crew of Planet Express (which, though harmless to robots, is deadly to humans). As Bender is an Unsympathetic Comedy Protagonist, he would not share it with anyone.
- Goliath uses this to his advantage in one episode of Gargoyles, when a replicator called Proteus has made himself the double of Elisa Mazza. Unable to tell which is the real Elisa, he inquires whether she ever had any doubts about him — a reference to a conversation they'd had earlier in the show. One of the Elisas immediately replies that she never doubted him, and he knows that she's the fake because he's perfectly aware that Elisa had doubted him.
- In the Goof Troop episode "Frankengoof", Frankengoof's monster looks very similar to Pete in Halloween makeup; so similar that his family initially mistakes it for him. Eventually they realize that the monster isn't really Pete because he's nice and willing to take responsibility, while the real Pete is a Jerkass and a Lazy Husband. The episode ends with his family deliberately abandoning him and bringing the monster home instead.
- In one episode of Gravity Falls, Wendy is fighting a shape-shifting monster who is disguised as her. When Dipper has to figure out who is who, he asks for a sign. The shapeshifter smiles at him flirtatiously, while the real Wendy mirrors the "zipped-lip" gesture she gave earlier, in dead seriousness. That was the only clue Dipper needed.
- A much more subtle version in the earlier episode Dreamscaperers: When the antagonist replaces Soos in order to piggyback off the main characters success, there are small tells that can clue an alert viewer in just before the reveal - for example, making a casual reference to his big fat arms, when the real Soos has been shown to be sensitive about his weight; or his disgust at one of Stans memories, when the real Soos holds Stan in incredibly high esteem and most likely wouldnt be fazed at said memory.
- In Jackie Chan Adventures, when Jackie is in the same room as a clone, Jade figures out the fake by asking if she can go to a theme park she's be asking to go to all episode; the fake says yes, while the real one replies no.
- Played humorously straight in the Johnny Bravo episode "Johnny's Inferno". Johnny is possessed by a junior devil named Derek who plans on committing evil deeds, but they stop for lunch at Pops's diner first. Johnny orders a plate of entrails and offers a credit card as payment. Pops immediately realizes something is very wrong, but not because of the odd food — it's because Johnny "tried to pay for his meal!"
- In one episode of Max Steel, John Dread hacks into Max's coms signal and replaces Berto Martinez as Max's Mission Control. Max figures this out due to Dread referring to Max as "hombre" and "amigo", in contrast to Martinez's standard term of affection, "hermano".
- On an episode of Men in Black, J instantly realized that a robot was impersonating K, because K would never had laughed at any of his jokes.
- My Little Pony: Friendship Is Magic: In the season 2 finale, Twilight realizes that Princess Cadence is not herself when she doesn't respond to their secret handshake and becomes even more suspicious when she sees Cadence acting unusually rude and selfish. Later on, Twilight encounters the real Princess Cadence, who proves her identity with the aforementioned secret handshake. The two race back to the wedding in time to expose the impostor.
- Scooby-Doo! Mystery Incorporated:
- Freddy and Daphne get impersonated. While Daphne's fake is at least a little believable, Freddie's fake is a textbook example. The rest of the gang didn't really need the secret clue.
- In another episode, Scooby and a gang of other mystery-solving sidekicks find their human friends supposedly turned into guinea pigs. Scooby knows something's up the moment the "Shaggy" guinea pig violently rejects a Scooby Snack.
- Spoofed in Sev Trek: Pus in Boots, an Australian parody of Star Trek: The Next Generation. Captain Pinchhard (Picard), Cmdr Piker (Riker), Gaudy (Geordi LaForge) and Beta (Data) are hunting a shapeshifting alien that's roaming loose on the Enterforaprize. They enter a room to find Measley Cruncher (Wesley Crusher) who's just invented a Plot Device which will detect the alien and save the Enterforaprize for the 47th time! Captain Pinchhard gives a Big "NO!" and disintegrates Measley on the spot.
- Parodied in The Simpsons, episode "Midnight Towboy", when Homer is kidnapped and calls his family.
Lisa: Dad? Where are you?
Homer: (reading from a cue card held by the kidnapper, bad acting) Do not worry, I am working.
Lisa: Working? Where?
Homer: Ask no questions and do not call the police or I will kill me.
Lisa: You sound weird.
Homer: Everything is fine, goodbye forever. (hangs up)
- Happens in Slugterra when Twist is posing as Redhook. He invites the Shane Gang to discuss things over a glass of lemonade. This immediately alerts the Gang (except Pronto) that this is not not the real Redhook, as Redhook is never that sociable.
- A variation of this occurs in the Sonic SATAM series. Sally has been replaced with a robot duplicate, and the robot says a multitude of things she would never say. It's when she replaces a "thumbs up" gesture with Sonic with a "thumbs down" gesture that Sonic gets it.
- In Adventures of Sonic the Hedgehog, Sonic becomes concerned about Tails' safety, so after some false starts in finding him a family to adopt him, he finds what he thinks are his real parents. He leaves Tails with them, but then becomes depressed that he's gone. He has a flashback of the parents welcoming "Tails" to their family... and then suddenly remembers that he gave him the nickname Tails; Tails' real parents would have called him by his birth name, Miles. Sonic rushes to the rescue; the "parents" turn out to be Robotnik's robotic goons in disguise.
- All-around skewered in the South Park episode "Spookyfish", where "Evil Cartman" (actually a sweet and lovable Mirror Universe Cartman... from a MU where everyone has a goatee and is the opposite personality) and "Real Cartman" fight to avoid being sent back to the MU. When the goatee gets ripped off, one Cartman says they'll just have to send both back to be sure. Wanting "Evil Cartman" to stay, and knowing the "Real Cartman" would never be selfless enough to suggest such a thing, the boys send the other Cartman back...except that Real Cartman anticipated this and tricked them.
- In The Spectacular Spider-Man, Norman Osborn does not apologize. The Chameleon would, though.
- Star Wars: The Clone Wars: In the opening movie, Rex clues Anakin and Ahsoka into the fact that the surviving members of the group of clones have been captured by saying "Anakin, we've held the droids. What is your position?" This clues them in because all clones address Jedi by either "General" for Knights or "Commander" for Padawans, never by name. What's especially impressive about this is that Rex resisted a mindtrick from Ventress in order to do it. He just played along so she wouldn't realize it didn't work.
- In Super Friends: The Legendary Super Powers Show, three Super Friends infiltrate an Auction of Evil to get a piece of Gold Kryptonite from Darkseid by disguising themselves as ice aliens. However, in the auction, Darkseid notices that those "ice aliens" are strangely comfortable at the station's normal room temperature and realizes they are impostors and exposes them.
- On Teen Titans, the hero Jericho is possessing Cinderblock to get him and the other good guys into the bad guys' lair. However, the villains are immediately suspicious when "Cinderblock" says "Thank you" to one of their comments — having never fought these villains before, Jericho didn't realize that Cinderblock doesn't normally talk.
- In an episode of The Transformers, Megatron builds a clone of Optimus Prime to lure the Autobots to their doom. Just when he manages to convince the others that he's the real thing, they get word that Spike is in trouble. Megatron, trying to keep his plans on track, says that Spike is unimportant, cluing the others in that he's fake.
- In an episode of Transformers Prime Bulkhead noticed something off about his "friend" Wheeljack and asked him to tell the story of a particular battle. Makeshift, the impostor tells the story perfectly, but manages to get one crucial detail wrong... Bulkhead wasn't part of that battle.
- In the episode "E-Scream" from What's New, Scooby-Doo?, Velma realizes that she is inside a virtual reality game when she notices the rest of the gang acting strange. Fred doesn't want to split up, Daphne wears shoes that don't match, Shaggy and Scooby actually want to be used as live bait, and finally, Shaggy says "Toinks" instead of "Zoinks."
- When the Winx Club search for the Gem of Self-Confidence, Bloom, Stella and Aisha find themselves facing illusions based on their inner fears. Aisha faces an illusion of Nabu, and quickly realizes it's not really him when the illusion blames her for his death, which is something the real Nabu would never do.
- On Young Justice, Batman calling the Team "kids" helps tip off Robin that something's not right.
- Some biometric fingerprint scanners have a "panic" feature: One of the user's fingers is designated as the "panic finger": In normal conditions the user does not press it against the scanner to be verified; if they do, it still grants access but also trips a silent alarm (allowing the user to discreetly summon help if he is being coerced into opening the scanner lock).
- Similarly, password-based systems may include a "duress code" that triggers a remote alarm when entered.
- There is a persistent urban legend that if a mugger tries to force you to withdraw money from an ATM, typing your PIN backwards will let the authorities know you are being forced to do it. Contrary to popular belief, while this system has been seriously proposed (and endorsed by many police officers), it has never been implemented in the United States.
- On this same reasoning, many stores have an easy-open formula to open their tills (which silent alarms the police), or a harder version that implies calling a supervisor for everyday issues. Essentially, if you just open the cash register without a purchase, someone will know about it.
- Several home security alarm systems have implemented 'panic button' codes. Upon installation, the homeowner will pick two codes, one to arm/disarm the system normally, and one which functions as a silent alarm, seemingly disarming the system but actually calling for an immediate police dispatch to the home.
- Some businesses have, as a standard response to someone making threats, a protocol for calling 911. The employee tells the person they will have a supervisor paged, pick up the phone, dial 911, and then hang up. When 911 calls back, they respond as if talking to a supervisor with simple "yes" and "no" answers.
- It's very obvious when someone else is doing something on another person's Facebook, or MSN. There was a meme for a while of hacking, say, Bobby's Facebook and making his status "hi my name is Bobby" as a signature. Teens who frequently visit chat rooms and message boards normally only use general internet slang when they aren't being closely supervised by suspicious parents. When they are being closely supervised by suspicious parents, they use obscure or community-specific slang much more frequently, to let the other posters know that they're being watched. Sometimes, more directly, they'll say something like "P.O.S." — "Parents Over Shoulder".
- It is generally extremely obvious when a tourist is visiting another country and trying to blend in. For example, being in Australia and greeting everyone with "G'day" and putting on a very Crocodile Dundee accent will make you stand out as a foreigner; while some Aussies do say "G'day," most just say "Hello" or something similarly universal. As for the accent, since most tourists are at the cities (sorry middle of Australia), the accent is not as pronounced as Crocodile Dundee. Also, Aussies tend to crack jokes about tourists who do this, and it might be the same elsewhere (like a person wearing a "I <3 New York" T-shirt in New York) so it's probably not the best idea to try and imitate them.
- A news story in the mid-2000s (powerfully dramatized in this Super Bowl commercial) had a 911 dispatcher answer a phone call from a woman who, after giving her address, began placing an order for a pizza. The dispatcher was confused at first, but as the woman kept talking, he realized that she was being abused and needed to send a coded cry for help. He was able to recognize the distress in the woman's voice and send assistance.
- A literal case on the set of Doctor Who; when filming "Battlefield", there was a scene where Sophie Aldred (Ace) was trapped in a rapidly-filling water tank, and instructed to bang on the glass. Unfortunately, the glass cracked, and water was getting dangerously close to some electrical equipment. Sylvester McCoy noticed the impending danger, and had seconds to warn the crew, but had to do it in a way that wouldn't be mistaken for the Doctor. He managed it with a Precision S Bomb, and Aldred was saved in the nick of time.
- People battling depression tend to be listless, gloomy, unmotivated, or feeling other emotions that convey depression. Because depression is not something one can just get over by themselves in a day, it can look quite unusual for the affected person to suddenly display more positive feelings. For people who deal with handling people affected by depression, someone suddenly becoming happy (or at least more at ease) is a serious red flag indicating the person may be prepared to commit suicide since they've come to terms with it. This is distinct from Bipolar Disorder, where depression and happiness regularly switch places.
- Subverted in April 2013, when several days after the Boston Marathon bombing, Dun Meng was carjacked by the Tamerlan and Dzhokar Tsarnev, the perpetrators. During the course of his 90 minute ordeal, a friend called him, prompting one of the brothers to warn him, "If you say one word in Chinese, I will kill you right now." His friend was confused as to why he was speaking in English, but not enough to realize that something was wrong.