A tell is a very subtle, but nonetheless noticeable, change in a person's behavior, appearance, or demeanor. In poker, a skilled player can detect another player's tell, and thus can generally get a clue regarding what the other player thinks of his hand (for good or bad). Similarly, people have unconscious reactions to events around them, things said to them, and other stimuli. Someone skilled in reading body language can use these tells to "read" another person's attitudes, intentions, and sometimes even motivations. Basically, Bob knows that Alice is lying because whenever she lies, her left eye twitches. Her eye twitching is her tell.

Common tells include heart-rate and respiration changes, shaking hands, changes in voice level, sudden and inappropriate displays of confidence or aggression, flushing or blushing, eye ticks, "subtle" glances toward things that the person wants to keep hidden, not meeting the eyes of a questioner, and so on. Some characters have [[PinocchioNose different symptoms]]. (On the other hand, some of these are common characteristics of introverts, or of people who get nervous while being interrogated. See {{The Cassandra}}.)

If a person is unaware that he's giving a tell, this can go on for a while. On the other hand, it is always possible for a person to intentionally fake a tell, and thus lead the observer to make an error themselves. If this goes down multiple layers, with the observer knowing that the subject is faking, it becomes IKnowYouKnowIKnow.

Often seen when the characters in a work play poker, naturally, but can appear in other situations.

PinocchioNose is the subtrope for tells specifically related to ''direct lying''; please add direct lie-specific example to that page, not here.

A LivingLieDetector can always spot a lie, even if there is no tell. HesitationEqualsDishonesty is a subtrope.

See also TheTell for characters with a tell that points to their emotional state rather than their honesty.

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!!Examples:

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[[folder: Anime And Manga ]]

* ''Manga/LiarGame'':
** Akiyama instructs one of his teammates about this in the third round of the game. It's a cover for what he's really trying to accomplish, and tells have nothing to do with his actual plan.
** Also features in the second revival round. Fukunaga apparently betrays Team Akiyama by telling Nao's opponent that she has a tell: she blinks twice whenever she lies. Nao's opponent uses this information to wipe the floor with her...but it's all a ruse, one planned by ''[[TheDitz Nao]] [[AllLovingHero herself]]'', and as soon as her opponent is feeling overconfident, Nao lures her into a trap that instantly reverses the situation.
* In ''CaseClosed'' they bring up a supposed CIA method of lie detection - bringing the target's face uncomfortably close to their own, checking their pulse and iris at the same time.

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[[folder: Comic Books ]]

* In ''Comicbook/{{Daredevil}}'', Matt Murdock uses his superhumanly acute hearing to listen to people's heartbeat, and thus can tell when they are lying. He has been fooled on occasion, though, when the person he's talking to is such a practiced liar that they don't have a reaction to it. And in one case, he was fooled because the liar had a pacemaker.

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[[folder: Film ]]

* In the 2006 ''Film/CasinoRoyale'', Film/JamesBond observes that Le Chiffre's eye twitches when on a weak hand and deduces that it's his tell. Unfortunately, after he explains this to TheMole, Le Chiffre fakes it to lure Bond into losing his cash.
* At the opening poker game in ''Film/{{Maverick}}'', Maverick tells people that he's going to lose for one hour. At the end of the hour, he starts winning, and winning big, because he's spend the first hour learning everyone's tells. When Annabelle Bransford gets put out of the final Championship game, the following exchange takes place:
-->'''Annabelle:''' How'd you know I was bluffing? I didn't do any of my tells! I didn't shuffle my cards, I didn't pull my hair... I didn't even flick my teeth!\\
'''Maverick: ''' You held your breath. If you'd been excited, you would have started breathing harder.\\
'''Annabelle: ''' I did not. ''(looks at the Commodore)'' Did I? ''(the Commodore nods, and Annabelle looks at Angel)'' Did I? ''(Angel nods, and Annabelle looks at the dealer)'' Did I? ''(The dealer nods)'' Well... I'll just pretend I was playing with someone else's money.\\
'''Maverick: ''' That shouldn't be too hard.
* The Russian mobster, [[NamesToRunAwayFromReallyFast Teddy KGB]] in ''Film/{{Rounders}}'' played with his oreos as his "tell", as the main character noticed mid-game.

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[[folder: Literature ]]

* Comes up in the ''Literature/HonorHarrington'' book ''Flag in Exile.'' Honor is facing off against [[spoiler: Steadholder Burdette]] in a sword duel, and the narration goes into detail about tells, which Graysons call the "crease," and how it can be used to predict a swordsman's opponent. It's considered unreliable, since each person has a different "crease," making it difficult to figure out a person's crease without knowing them. Honor is able to instinctively feel [[spoiler:Burdette's]] "crease", allowing her to win the fight. Though even she admits she didn't actually know what [[spoiler:Burdette's]] actual crease was.
* In ''Literature/NineteenEightyFour'' one of the overall goals of those in charge seems to be to make it so anyone can tell when anyone else is lying, without even trying to. More broadly, to involuntarily know everyone else's thoughts.
* In ''The Space Merchants'' by Creator/FrederikPohl and Cyril M. Kornbluth, the protagonist Mitch Courtenay and his estranged wife, Kathy, each know the other's "Tell". This is a hint about how much they know and love each other.
* In ''Scratch'' by [=Troon McAllister=], the prologue is a 32 hour poker game between the main protagonist (Eddie) and the scene's point of view character (Whitman). He picks up Eddie's tell and proceeds to try to kick his ass...but loses horribly. As Eddie leaves the private poker room, the owner asks if he did his usual bullshit tell.

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[[folder: Live Action TV ]]

* Played straight and discussed in an episode of ''Series/ThirtyRock'' wherein Jack reveals and exploits the other characters' various tells during a high-stakes game of poker.
* Once on ''Series/{{Mash}}'' the guys realized that Winchester whistled louder when he was bluffing in poker.
* This trope is pretty much the ''raison d'etre'' for the TV series ''Series/LieToMe''.
* Jack Dalton had a tell on ''Series/MacGyver''.
* Inverted in ''Series/{{Monk}}'': Monk realizes that a suspect who passed a polygraph test was lying when he later told a lie while on a treadmill and didn't show a change in heart rate.
* Olive in ''PushingDaisies'' answers questions with questions when she's hiding something; Ned has a facial twitch.
* Played for laughs in one episode of ''Series/{{Leverage}}'':
--> '''Eliot''': You have a tell.
--> '''Hardison''': I have a tell?
--> '''Eliot''': Yes.
--> '''Hardison''': I have a tell for [[SeriousBusiness Rock Paper Scissors]]?
--> '''Eliot''': Yes!
* In ''Series/{{Frasier}}'', Niles' nose bleeds not so much when he's lying as when he's broken his ethical code. Of course, the two overlap.
** Frasier has one as well: when he's knowingly broken his ethical code, he starts having attacks of nausea.
* ''So'' much of the drama ''Series/WizardsOfWaverlyPlace'' is based around lies/lying. Alex in particular knows all about lies and how to spot one.
* The British panel game ''WouldILieToYou'' has this as part of its gimmick. Savvy guests have tried to block or mask their tells for fear of giving something away (one pulled out a pair of sunglasses; another tried to do several at once).
* In the ''DoctorWho'' Christmas episode, "The Snowmen", Silurian Lady Vashtra does this when she questions Clara about her interest in the Doctor, ordering Clara to respond to her questions with single-word answers. In her own words, "Truth is singular. Lies are just words, words, words." Clara remarks on this when Vashtra explains at length on how the Doctor has turned his back on humanity by saying simply, "Words."
* In the ''Series/{{Supernatural}}'' episode [[Recap/SupernaturalS02E22AllHellBreaksLoosePartTwo "All Hell Breaks Loose, Part Two" (S02, Ep22)]], Dean, who is usually a ConsummateLiar, can not meet Bobby's eyes.

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[[folder: Radio ]]


* ''FibberMcGeeAndMolly'': If somebody's wife always calls him "Fibber" rather than by his given name, you'd be wise to take notice.

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[[folder: Video Games ]]

* Franchise/AceAttorney: Apollo Justice can tell when a person is lying due to his bracelet tightening in reaction to the tics because [[spoiler:it's made of a special alloy that causes it to expand/contract to a perfect fit on a person wrist due to body heat. Because the bracelet is a perfect fit, it appears to vibrate when a nervous tick is appearing. But what is really happening is that Apollo is sub-consciously aware of the liar's tensing-up. This causes Apollo to tense causing a mini-tell of his own, the muscles in his arm start to twitch and because the bracelet is just tight enough it appears to be reacting.]] Ironically, Apollo's ability is very realistic (not to mention scientifically plausible) in contrast to Phoenix's obviously unrealistic magatama. Trucy has the same ability because [[spoiler: she's Apollo's half-sister]], which makes her an excellent poker player.
* ''LANoire'' used high definition and detailed facial software to make it so the players could better guess if the person they are speaking to is lying to them.
** While early levels obviously have the MoCapped actors ham it up a bit for the player to get used to the tactic, later in the game the tells become much more subtle and realistic.
* Referenced in ''VideoGame/MassEffect2''; [[MadScientist Mordin]] mentions that Salarian body language gives two different instinctive reactions when they're concealing something; one reaction is for when they're concealing something embarrassing or harmful to themselves, and one is for when they're concealing something harmful to the other person. He explains that it is virtually impossible to fake these reactions convincingly, and consequently seeing the first reaction incites Salarians to try and find out what the secret is, while seeing the second usually causes them to back off.

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[[folder: Truth In Television ]]

* Microexpressions are an uncontrollable action that lasts just a fraction of a second. Psychologists have managed to connect these to specific emotions, when they don't match up with what a person says they are likely to not be telling the whole truth.

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[[folder: Western Animation ]]

* In ''WesternAnimation/FatherOfThePride'', Sarmoti is the only player in a poker game to know everyone's tells, as well as his own. Every other player seems completely oblivious to their own and each others' tells, or even that this aspect of the game exists. Which is odd because one player's tell is so obvious that everyone immediately picks up on it.
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