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Added "The Case of the Double Husband" Example to Works List
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* In ''Literature/TheCaseOfTheDoubleHusband'', Ted begins acting very strangely in the wake of his best friend George's death. Ted's normally boorish behavior and low-class tastes in entertainment (i.e. attending football matches, horse races, and reading cheap whodunits) start to align with George's more refined preferences (i.e. listening to classical music, going antiquing, and reading poetry). This is what clues George's widow Grace in to the fact that [[spoiler: George's soul has taken residence in Ted's body]].
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* In ''LightNovel/ACertainMagicalIndex'' crossover [[https://www.baka-tsuki.org/project/index.php?title=Toaru_Majutsu_no_Index:Crossover novella]], an evil "shadow" of [[LightNovel/TheUnexploredSummonBloodSign 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.
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* In ''LightNovel/ACertainMagicalIndex'' ''Literature/ACertainMagicalIndex'' crossover [[https://www.baka-tsuki.org/project/index.php?title=Toaru_Majutsu_no_Index:Crossover novella]], an evil "shadow" of [[LightNovel/TheUnexploredSummonBloodSign [[Literature/TheUnexploredSummonBloodSign 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.
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* ''Literature/ASeriesOfUnfortunateEvents'' presents a written variant in the third book. The trio's GrammarNazi 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.
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* ''Literature/ASeriesOfUnfortunateEvents'' presents a written variant in the third book. The trio's GrammarNazi auntie guardian Aunt Josephine 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.
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* In ''Literature/WaysideSchool Gets a Little Stranger'', the students' voices are stolen by [[EvilTeacher evil substitute teacher]] [[VoiceChangeling Mr. Gorf]]; when lunch lady Miss Mush 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, even successfully improvising a lie about a field trip when he realizes he missed one of them. Miss Mush figures out something is wrong, though, when the voice of Kathy, [[{{jerkass}} 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 [[BatDeduction 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.
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* In ''Literature/WaysideSchool Gets a Little Stranger'', the students' voices are stolen by [[EvilTeacher evil substitute teacher]] [[VoiceChangeling Mr. Gorf]]; Gorf; when lunch lady Miss Mush asks how the class is doing from outside the door, Mr. Gorf tries to trick her by [[VoiceChangeling using the voices of the students students]] to say that everything is okay, even successfully improvising a lie about a field trip when he realizes he missed one of them. Miss Mush figures out something is wrong, though, when the voice of Kathy, [[{{jerkass}} 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 [[BatDeduction 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.
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* In the second ''Literature/MyBrotherIsASuperhero'' book, the alien invaders create a robotic copy of Cara to serve as a HoneyTrap to Zack. While Zack refuses to believe this, Lara (Cara's sister) is convinced when "Cara" kisses Zack, despite the fact that she has a boyfriend.
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** 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 unable to hear what she's saying) when relaying information about her situation (e.g. --press-- "I need four pork chops"--release--"it's VERY IMPORTANT"--press--"we're having company tomorrow, so it's almost"--release--"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.
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** Another short story story, "Philomel Cottage", 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 unable to hear what she's saying) when relaying information about her situation (e.g. --press-- "I need four pork chops"--release--"it's VERY IMPORTANT"--press--"we're having company tomorrow, so it's almost"--release--"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.
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* ''Literature/FengshenYanyi'': the hero, Jiang Ziya, has always been shown as a capable diviner, quick to recognize omens. However, when he's being hexed by the Fallen Souls Formation and slowly losing his ten souls [[note]] (In Taoist philosophy, souls are divided in three Hun parts, representing Yang, reason and consciousness, and seven Po part for Yin and life energy) [[/note]] he becomes drowsy and more lethargic. His disciples are worried, but when they feel a chilling wind blow across the hall, ask Ziya for a divination and hear him quickly dismiss it as a mere breeze they finally realize that someone's trying to curse or kill their beloved master.
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The trope is being renamed, as discussed in this
TRS thread.
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** The short story "The Adventure of the Sinister Stranger" uses a {{Homage}} to the [[WeirdAlEffect 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.
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** The short story "The Adventure of the Sinister Stranger" uses a {{Homage}} to the [[WeirdAlEffect [[ParodyDisplacement 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.
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** 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)
*** 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)
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** In ''The Secret Adversary'', Tommy realises that a message sent to him from Tuppence is not actually from her, as it is signed "Twopence".
***"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)
***
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** In the short story "The Adventure of the Sinister Stranger" uses a {{Homage}} to the [[WeirdAlEffect 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.
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** In the The short story "The Adventure of the Sinister Stranger" uses a {{Homage}} to the [[WeirdAlEffect 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.
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* Clark from ''Literature/ExperimentalFilm'' is autistic and almost never makes eye contact, which is why his mother is alarmed when he looks right at her as he begs her not to go to the Lake of the North area.
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* ''Literature/TellMeHowYouReallyFeel'': Sana generally dislikes swearing, and tells people not to. When she swears herself, it tips off her cheerleader squad mates she is very pissed off.
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* ''Literature/{{Discworld}}'': While Magrat is hiding from vampires in ''Discworld/CarpeJugulum'', "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.
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* ''Literature/{{Discworld}}'': While Magrat is hiding from vampires in ''Discworld/CarpeJugulum'', ''Literature/CarpeJugulum'', "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.
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* ''Literature/{{Animorphs}}'': In ''The Capture'', when Jake is [[MindControl infested]] by a [[PuppeteerParasite Yeerk]], [[TokenNonHuman Ax]] suspects him, because, after falling heads first into the pool full of yeerks, he is zoning out, which is a telltale sign of a first-time Controller. Others are initially sceptical but are conviced, when Ax tries to touch "Jake", causing him to scream "Get your hand off me, [[FantasticSlur Andalite filth]]!"
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* ''Literature/{{Animorphs}}'': ''Literature/{{Animorphs}}'':
** In ''The Capture'', when Jake is [[MindControl infested]] by a [[PuppeteerParasite Yeerk]], [[TokenNonHuman Ax]] suspects him, because, after fallingheads first headfirst into the pool full of yeerks, he is zoning out, which is a telltale sign of a first-time Controller. Others The others are initially sceptical but are conviced, convinced when Ax tries to touch "Jake", causing him to scream "Get your hand off me, [[FantasticSlur Andalite filth]]!"
** In ''The Capture'', when Jake is [[MindControl infested]] by a [[PuppeteerParasite Yeerk]], [[TokenNonHuman Ax]] suspects him, because, after falling
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* ''Franchise/StarTrekNovelVerse'':
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* ''Franchise/StarTrekNovelVerse'':''Literature/StarTrekNovelVerse'':
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** Done visually and deliberately in an short story concerning a Solarian tech forced by a rogue Havenite State Security crew to assist them in pretending to by a Manticoran warship. As part of the deception, he programs the computer to alter the visuals transmitted by their communication system, so it appears they're wearing Manticoran uniforms and are on the bridge of a fully-staffed warship, with CGI "extras" in the background. When they encounter an Andermani warship, it appears the deception is working, only for the Anderman captain to spring a surprise attack that captures the StateSec ship and crew. Among the CGI "extras" was a digital Honor Harrington, wearing a junior officer's uniform. This tipped off the captain because not only did he happen to know ''Admiral'' Harrington personally, but Harrington was, at the time, believed by everyone to be dead.
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** Done visually and deliberately in an short story concerning a Solarian tech forced by a rogue Havenite State Security crew to assist them in pretending to by a Manticoran warship. As part of the deception, he programs the computer to alter the visuals transmitted by their communication system, so it appears they're wearing Manticoran uniforms and are on the bridge of a fully-staffed warship, with CGI "extras" in the background. When they encounter an Andermani warship, it appears the deception is working, only for the Anderman captain to spring a surprise attack that captures the StateSec ship and crew. Among the CGI "extras" was a digital Honor Harrington, wearing a junior officer's uniform. This tipped off the captain because not only did he happen to know ''Admiral'' Harrington personally, but Harrington was, at the time, believed by everyone to be dead.
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** Done visually and deliberately in an short story concerning a Solarian tech forced by a rogue Havenite State Security crew to assist them in pretending to by a Manticoran warship. As part of the deception, he programs the computer to alter the visuals transmitted by their communication system, so it appears they're wearing Manticoran uniforms and are on the bridge of a fully-staffed warship, with CGI "extras" in the background. When they encounter an Andermani warship, it appears the deception is working, only for the Anderman captain to spring a surprise attack that captures the StateSec ship and crew. Among the CGI "extras" was a digital Honor Harrington, wearing a junior officer's uniform. This tipped off the captain because not only did he happen to know ''Admiral'' Harrington personally, but Harrington was, at the time, believed by everyone to be dead.
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* In ''Literature/WaysideSchool Gets a Little Stranger'', the students' voices are stolen by [[EvilTeacher evil substitute teacher]] [[VoiceChangeling 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.
to:
* In ''Literature/WaysideSchool Gets a Little Stranger'', the students' voices are stolen by [[EvilTeacher evil substitute teacher]] [[VoiceChangeling Mr. Gorf]]; when the lunch lady Miss Mush 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 okay, even successfully improvising a lie about a field trip when he realizes he missed one of them. Miss Mush figures out something is wrong, though, when the voice of Kathy, [[{{jerkass}} the meanest student in the class 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 [[BatDeduction somehow figures out 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.
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I own that story. Releasing the receiver switch enables the person to hear, pressing it blocks voice transmission. An odd glitch in early-ish phones.
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** 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.
to:
** 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 unable to hear what she's saying) when relaying information about her situation (e.g. --press-- "I need four pork chops"--press--"it's chops"--release--"it's VERY IMPORTANT"--release--"we're IMPORTANT"--press--"we're having company tomorrow, so it's almost"--press--"a almost"--release--"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.
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* ''Literature/{{Animorphs}}'': In ''The Capture'', when Jake is [[DemonicPossession infested]] by a [[PuppeteerParasite Yeerk]]. When Controller!Jake sees [[TokenNonHuman Ax]], he's so overcome with FantasticRacism 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, [[FantasticSlur Andalite filth]]!"
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* ''Literature/{{Animorphs}}'': In ''The Capture'', when Jake is [[DemonicPossession [[MindControl infested]] by a [[PuppeteerParasite Yeerk]]. When Controller!Jake sees Yeerk]], [[TokenNonHuman Ax]], he's so overcome with FantasticRacism that for a split second Jake's face shows unbridled hatred, Ax]] suspects him, because, after falling heads first into the pool full of yeerks, he is zoning out, which gets everyone suspicious. The deal is sealed a telltale sign of a first-time Controller. Others are initially sceptical but are conviced, when Ax tries to touch "Jake", causing him to scream "Get your hand off me, [[FantasticSlur Andalite filth]]!"
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* 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.
* ''Literature/ASeriesOfUnfortunateEvents'' 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.
* ''Literature/ASeriesOfUnfortunateEvents'' 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.
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* In the ''Rugrats'' ''WesternAnimation/{{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.
* ''Literature/ASeriesOfUnfortunateEvents'' presents a written variant in the third book. The trio'sGrammar Nazi GrammarNazi 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.
* ''Literature/ASeriesOfUnfortunateEvents'' presents a written variant in the third book. The trio's
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* ''[[Franchise/StarTrekNovelVerse]]'':
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* ''[[Franchise/StarTrekNovelVerse]]'':''Franchise/StarTrekNovelVerse'':
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* ''Literature/{{Animorphs}}'': In "The Capture," when Jake is [[DemonicPossession infested]] by a [[PuppeteerParasite Yeerk]]. When Controller!Jake sees [[TokenNonHuman Ax]], he's so overcome with FantasticRacism 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, [[FantasticSlur Andalite filth]]!"
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* ''Literature/{{Animorphs}}'': In"The Capture," ''The Capture'', when Jake is [[DemonicPossession infested]] by a [[PuppeteerParasite Yeerk]]. When Controller!Jake sees [[TokenNonHuman Ax]], he's so overcome with FantasticRacism 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," "Jake", causing him to scream "Get your hand off me, [[FantasticSlur Andalite filth]]!" filth]]!"
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%% This page has been alphabetized. Please add new examples in the correct order.
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* ''Literature/{{Animorphs}}'': In
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* Detective Elijah Baley is informed that his wife Jessie is a member of a criminal organization in ''Literature/TheCavesofSteel''. He knows it is a lie because her name is given as Jezebel, a name she never uses.
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* Detective Elijah Baley is informed that his wife Jessie is a member of a criminal organization in ''Literature/TheCavesofSteel''. ''Literature/TheCavesOfSteel''. He knows it is a lie because her name is given as Jezebel, a name she never uses.uses.
* In ''LightNovel/ACertainMagicalIndex'' crossover [[https://www.baka-tsuki.org/project/index.php?title=Toaru_Majutsu_no_Index:Crossover novella]], an evil "shadow" of [[LightNovel/TheUnexploredSummonBloodSign 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 ''LightNovel/ACertainMagicalIndex'' crossover [[https://www.baka-tsuki.org/project/index.php?title=Toaru_Majutsu_no_Index:Crossover novella]], an evil "shadow" of [[LightNovel/TheUnexploredSummonBloodSign 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.
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* In ''Literature/ADarkerShadeOfMagic'', 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".
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* In ''Literature/GauntsGhosts'', 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."
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* ''Literature/HonorHarrington'': 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 [[FakingEngineTrouble 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. [[spoiler:''Sirius'' turns out to be a Q-ship, a warship disguised as a freighter. ]]
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* ''Literature/HonorHarrington'': 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 [[FakingEngineTrouble waiting for parts for its Warshawski Sails]], 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. [[spoiler:''Sirius'' turns out to be a Q-ship, a warship disguised as a freighter. ]]
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* In ''Literature/JenniferTheJerkIsMissing'', 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)
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* In ''Literature/JenniferTheJerkIsMissing'', 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)wasn't.)
* ''Literature/ShadesOfMagic'': 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".
* ''[[Franchise/StarTrekNovelVerse]]'':
** In ''Imzadi'', a future Data trying to preserve the timeline by any means necessary (including killing Deanna Troi) disables present Data and impersonates him long enough to get Deanna away from everyone else. However, present day Riker eventually realizes that he can't be present Data because he used contractions when talking to her.
* ''[[Franchise/StarTrekNovelVerse]]'':
** In ''Imzadi'', a future Data trying to preserve the timeline by any means necessary (including killing Deanna Troi) disables present Data and impersonates him long enough to get Deanna away from everyone else. However, present day Riker eventually realizes that he can't be present Data because he used contractions when talking to her.
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** In one of the [[Literature/XWingSeries 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 [[JustJokingJustification claiming it was a joke]], to no avail.
* ''[[Franchise/StarTrekNovelVerse]]'':
** In ''Imzadi'', a future Data trying to preserve the timeline by any means necessary (including killing Deanna Troi) disables present Data and impersonates him long enough to get Deanna away from everyone else. However, present day Riker eventually realizes that he can't be present Data because he used contractions when talking to her.
* ''[[Franchise/StarTrekNovelVerse]]'':
** In ''Imzadi'', a future Data trying to preserve the timeline by any means necessary (including killing Deanna Troi) disables present Data and impersonates him long enough to get Deanna away from everyone else. However, present day Riker eventually realizes that he can't be present Data because he used contractions when talking to her.
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** In one of the [[Literature/XWingSeries 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 [[JustJokingJustification claiming it was a joke]], to no avail.
* ''[[Franchise/StarTrekNovelVerse]]'':
** In ''Imzadi'', a future Data trying to preserve the timeline by any means necessary (including killing Deanna Troi) disables present Data and impersonates him long enough to get Deanna away from everyone else. However, present day Riker eventually realizes that he can't be present Data because he used contractions when talking to her.avail.
* ''[[Franchise/StarTrekNovelVerse]]'':
** In ''Imzadi'', a future Data trying to preserve the timeline by any means necessary (including killing Deanna Troi) disables present Data and impersonates him long enough to get Deanna away from everyone else. However, present day Riker eventually realizes that he can't be present Data because he used contractions when talking to her.
* ''TabletopGame/Warhammer40000'': In ''Literature/GauntsGhosts'', 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 ''Literature/{{Worm}}'', one of these acts as a WhamLine in [[spoiler:[[http://parahumans.wordpress.com/2012/09/29/prey-14-8/ Chapter 14.8]]]], when [[spoiler:Bonesaw]] is pretending to be [[spoiler:Tattletale]] in order to gain Skitter's trust.
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* In a ''LightNovel/ACertainMagicalIndex'' crossover [[https://www.baka-tsuki.org/project/index.php?title=Toaru_Majutsu_no_Index:Crossover novella]], an evil "shadow" of [[LightNovel/TheUnexploredSummonBloodSign 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 ''Literature/{{Worm}}'', one of these acts as a WhamLine in [[spoiler:[[http://parahumans.wordpress.com/2012/09/29/prey-14-8/ Chapter 14.8]]]], when [[spoiler:Bonesaw]] is pretending to be [[spoiler:Tattletale]] in order to gain Skitter's trust.
* In ''Literature/{{Worm}}'', one of these acts as a WhamLine in [[spoiler:[[http://parahumans.wordpress.com/2012/09/29/prey-14-8/ Chapter 14.8]]]], when [[spoiler:Bonesaw]] is pretending to be [[spoiler:Tattletale]] in order to gain Skitter's trust.
to:
* In ''Literature/{{Worm}}'', one of these acts as a WhamLine in [[spoiler:[[http://parahumans.wordpress.com/2012/09/29/prey-14-8/ Chapter 14.8]]]], when [[spoiler:Bonesaw]] is pretending to be [[spoiler:Tattletale]] in order to gain Skitter's trust.
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* ''[[Franchise/StarTrekNovelVerse]]'':
** In ''Imzadi'', a future Data trying to preserve the timeline by any means necessary (including killing Deanna Troi) disables present Data and impersonates him long enough to get Deanna away from everyone else. However, present day Riker eventually realizes that he can't be present Data because he used contractions when talking to her.
** In ''Imzadi'', a future Data trying to preserve the timeline by any means necessary (including killing Deanna Troi) disables present Data and impersonates him long enough to get Deanna away from everyone else. However, present day Riker eventually realizes that he can't be present Data because he used contractions when talking to her.
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* ''Literature/{{Animorphs}}'': In "The Capture," when Jake is [[DemonicPossession infested]] by a [[PuppeteerParasite Yeerk]]. When Controller!Jake sees [[TokenNonHuman Ax]], he's so overcome with FantasticRacism 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, [[FantasticSlur 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 BadLiar; 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 NotHimself.
* John Birmingham's ''Literature/AxisOfTime'': A [[TimeTravel 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 ''Literature/TheCavesofSteel''. He knows it is a lie because her name is given as Jezebel, a name she never uses.
* Creator/AgathaChristie:
** In the short story "The Adventure of the Sinister Stranger" uses a {{Homage}} to the [[WeirdAlEffect 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 [[spoiler: 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 ''Literature/ADarkerShadeOfMagic'', 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".
* ''Literature/{{Discworld}}'': While Magrat is hiding from vampires in ''Discworld/CarpeJugulum'', "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.
* ''Literature/TheDresdenFiles'': In ''Literature/BloodRites'', after the two of them are captured by the BigBad, 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 [[VitriolicBestBuds nature]] of their friendship and her strong, assertive personality.
* In ''Literature/EndersGame'', 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.
* ''Literature/TheFamousFive'':
** 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 ''Literature/{{Fearless}}'', there's a StoryArc 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 Creator/FrederickForsyth 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 ''Literature/GauntsGhosts'', 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 ''Literature/GreenRider'', 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 Creator/DianeDuane 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.
* ''Literature/HonorHarrington'': 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 [[FakingEngineTrouble 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. [[spoiler:''Sirius'' turns out to be a Q-ship, a warship disguised as a freighter. ]]
* Lieutenant Eve Dallas from the ''Literature/InDeath'' 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 Literature/JackReacher 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 ''Literature/JenniferTheJerkIsMissing'', 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 Literature/JoePickett 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.
* ''Literature/LemonySnicketTheUnauthorizedAutobiography'' 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. [[spoiler:Or, errors she might have made as a coded signal that all was not well.]] [[spoiler: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 ''Literature/{{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 ''Literature/MaximumRide'' 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 LethalChef 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 Literature/NancyDrew 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 ''Literature/ReconstructingAmelia''. 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 ''[[CuteBookworm English]]'' paper. When she receives an anonymous text telling her Amelia didn't actually kill herself, she begins investigating her daughter's death. [[spoiler:She's right -- Amelia was actually pushed, and the so-called cheating was actually a FrameUp. Kate finds her real paper and uses it to clear Amelia's name.]]
* In the Creator/TomClancy[=/=]Larry Bond novel ''Literature/RedStormRising'', 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 MissionControl as part of the villains' plan. As is explained [[UnspokenPlanGuarantee later]], he had a pre-existing arrangement where every message he sent would include either a smiley face[[note]]:)[[/note]] or a frownie face[[note]]:([[/note]] depending on whether he was fine or under duress. In this case, it is treated as a characteristic bit of paranoia [[ProperlyParanoid 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.
* ''Literature/ASeriesOfUnfortunateEvents'' 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 ''Literature/SewerGasAndElectric'', one of the main characters (a parody of Creator/AynRand'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.
* ''Franchise/StarWarsLegends'':
** In ''Literature/HanSolosRevenge'' 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 [[Literature/XWingSeries 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 [[JustJokingJustification claiming it was a joke]], to no avail.
* ''Literature/TimeMachineSeries: 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.
* ''Literature/VorkosiganSaga'': In ''Literature/MirrorDance'', 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 ''Literature/WaysideSchool Gets a Little Stranger'', the students' voices are stolen by [[EvilTeacher evil substitute teacher]] [[VoiceChangeling 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 ''Literature/WorldWarZ'' 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 short mystery story involving a group of women at some sort of get-together, one of the members sends a note saying she won't be able to make the meeting. The women reading the letter note discrepancies in the letter, each discrepancy referencing a number (including the absent member's middle initial in her signature being erroneously given as "O", which is taken to mean "0".) There are a total of seven errors in the letter, and when the errors are written out in their numerical form, one of the group theorizes it may be a telephone number. It is -- to the police.
* In a ''LightNovel/ACertainMagicalIndex'' crossover [[https://www.baka-tsuki.org/project/index.php?title=Toaru_Majutsu_no_Index:Crossover novella]], an evil "shadow" of [[LightNovel/TheUnexploredSummonBloodSign 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 ''Literature/{{Worm}}'', one of these acts as a WhamLine in [[spoiler:[[http://parahumans.wordpress.com/2012/09/29/prey-14-8/ Chapter 14.8]]]], when [[spoiler:Bonesaw]] is pretending to be [[spoiler:Tattletale]] in order to gain Skitter's trust.
** 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 BadLiar; 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 NotHimself.
* John Birmingham's ''Literature/AxisOfTime'': A [[TimeTravel 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 ''Literature/TheCavesofSteel''. He knows it is a lie because her name is given as Jezebel, a name she never uses.
* Creator/AgathaChristie:
** In the short story "The Adventure of the Sinister Stranger" uses a {{Homage}} to the [[WeirdAlEffect 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 [[spoiler: 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 ''Literature/ADarkerShadeOfMagic'', 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".
* ''Literature/{{Discworld}}'': While Magrat is hiding from vampires in ''Discworld/CarpeJugulum'', "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.
* ''Literature/TheDresdenFiles'': In ''Literature/BloodRites'', after the two of them are captured by the BigBad, 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 [[VitriolicBestBuds nature]] of their friendship and her strong, assertive personality.
* In ''Literature/EndersGame'', 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.
* ''Literature/TheFamousFive'':
** 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 ''Literature/{{Fearless}}'', there's a StoryArc 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 Creator/FrederickForsyth 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 ''Literature/GauntsGhosts'', 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 ''Literature/GreenRider'', 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 Creator/DianeDuane 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.
* ''Literature/HonorHarrington'': 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 [[FakingEngineTrouble 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. [[spoiler:''Sirius'' turns out to be a Q-ship, a warship disguised as a freighter. ]]
* Lieutenant Eve Dallas from the ''Literature/InDeath'' 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 Literature/JackReacher 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 ''Literature/JenniferTheJerkIsMissing'', 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 Literature/JoePickett 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.
* ''Literature/LemonySnicketTheUnauthorizedAutobiography'' 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. [[spoiler:Or, errors she might have made as a coded signal that all was not well.]] [[spoiler: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 ''Literature/{{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 ''Literature/MaximumRide'' 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 LethalChef 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 Literature/NancyDrew 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 ''Literature/ReconstructingAmelia''. 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 ''[[CuteBookworm English]]'' paper. When she receives an anonymous text telling her Amelia didn't actually kill herself, she begins investigating her daughter's death. [[spoiler:She's right -- Amelia was actually pushed, and the so-called cheating was actually a FrameUp. Kate finds her real paper and uses it to clear Amelia's name.]]
* In the Creator/TomClancy[=/=]Larry Bond novel ''Literature/RedStormRising'', 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 MissionControl as part of the villains' plan. As is explained [[UnspokenPlanGuarantee later]], he had a pre-existing arrangement where every message he sent would include either a smiley face[[note]]:)[[/note]] or a frownie face[[note]]:([[/note]] depending on whether he was fine or under duress. In this case, it is treated as a characteristic bit of paranoia [[ProperlyParanoid 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.
* ''Literature/ASeriesOfUnfortunateEvents'' 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 ''Literature/SewerGasAndElectric'', one of the main characters (a parody of Creator/AynRand'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.
* ''Franchise/StarWarsLegends'':
** In ''Literature/HanSolosRevenge'' 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 [[Literature/XWingSeries 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 [[JustJokingJustification claiming it was a joke]], to no avail.
* ''Literature/TimeMachineSeries: 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.
* ''Literature/VorkosiganSaga'': In ''Literature/MirrorDance'', 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 ''Literature/WaysideSchool Gets a Little Stranger'', the students' voices are stolen by [[EvilTeacher evil substitute teacher]] [[VoiceChangeling 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 ''Literature/WorldWarZ'' 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 short mystery story involving a group of women at some sort of get-together, one of the members sends a note saying she won't be able to make the meeting. The women reading the letter note discrepancies in the letter, each discrepancy referencing a number (including the absent member's middle initial in her signature being erroneously given as "O", which is taken to mean "0".) There are a total of seven errors in the letter, and when the errors are written out in their numerical form, one of the group theorizes it may be a telephone number. It is -- to the police.
* In a ''LightNovel/ACertainMagicalIndex'' crossover [[https://www.baka-tsuki.org/project/index.php?title=Toaru_Majutsu_no_Index:Crossover novella]], an evil "shadow" of [[LightNovel/TheUnexploredSummonBloodSign 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 ''Literature/{{Worm}}'', one of these acts as a WhamLine in [[spoiler:[[http://parahumans.wordpress.com/2012/09/29/prey-14-8/ Chapter 14.8]]]], when [[spoiler:Bonesaw]] is pretending to be [[spoiler:Tattletale]] in order to gain Skitter's trust.
