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->'''''Truth''': Noun. That which most easily appeals to the fears, hopes, and prejudices of the hearer; in essence, a lie.''

->'''''Lie''': Noun. That which causes its utterer to be reviled; in essence, the truth.''

->'''''Deceit''': Noun. Example: A dog rolls on the carcass of a dead possum in order to deceive other animals regarding his identity as a dog (whereas) a man lolls in the scents of church in order to deceive himself regarding his identity as a thief, an adulterer, and a liar (the difference is that the dog does not first have to endure being bored by the possum).''
-->-- Thorax, ''NineChickweedLane''

The thing about truth and deceptions is that they are always of a certain kind. If only you could recognize them before they arrive... Here are a few hints.

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!!Tropes of Truth
First, recognize honest intent, whether expressed as the plain truth or a technical falsehood. Possibilities include:

[[index]]
* Metaphoric Truth: 'I am a child at heart', 'The Earth is our mother', 'All men are brothers' -- all are known falsehoods spoken without intent to deceive. My father is not my brother,[[note]]well, [[ParentalIncest hopefully not]][[/note]] and my mother does not weigh 6.5 sextillion tons, but no one would take such statements literally -- [[TheDitz well, almost no one]].
** Mistaken Metaphor: A metaphor, mistaken for the simple truth. Frequently done by TheDitz, the LiteralGenie, and eavesdroppers, [[OopsIDidItAgain this]] is a [[BluntMetaphorsTrauma standard comic device]], and the spur for many a tragedy.
** LiteralMetaphor: The simple truth, mistaken for a metaphor. Often a part of the ProphecyTwist.
* AwfulTruth
* BewareTheHonestOnes
* BluntYes
* BrutalHonesty
* CassandraTruth
** ContagiousCassandraTruth
** ADogAteMyHomework
* DreamingTheTruth
* HelpfulHallucination
* HeroicVow
* HonestyIsTheBestPolicy
* IGaveMyWord
* ItWasHereISwear
* LieDetector
* NotEvenBotheringWithAnExcuse
* ProphecyTwist
** NoManOfWomanBorn
* SoCrazyItMustBeTrue
* TruthSerums
* VillainsNeverLie
** NewEraSpeech
* WillNotTellALie

!!Tropes of Deception
Second, learn the myriad shades of deception, purely for self-defense, of course.

* CassandraGambit: [[InvokedTrope invoking]] a CassandraTruth to hide something.
* CoverIdentityAnomaly: Missing some basic piece of information about someone you're pretending to be, often forcing you to make up something on the spot.
* DeliberatelyCuteChild: using a cute fašade to get what one wants.
* DidNotDieThatWay: a character finds out they have been lied to about a loved one's death.
* EmbarrassingCoverUp: Where the cover story goes into territory that makes the questioner regret asking.
* FalseReassurance, a lie that is the truth in its ExactWords. A guard at a railroad track back in the 1920s was testifying that he was swinging his lamp when the automobile crashed into the train at 3 in the morning. It was determined later that while he was swinging his lamp to warn oncoming traffic, the lamp was not lit at the time.
* FictionAsCoverup: Hiding the truth in plain sight by calling it fictional.
* ForgedMessage: Writing a message but making it look like someone else wrote it.
* GasLeakCoverup: A simple, dull, believable excuse for something that is none of those.
* HalfTruth: A statement that is technically true, but extremely misleading if you don't have all the information.
* ISurrenderSuckers: A character pretends to surrender but attacks once the opponent lowers his guard.
* IgnoranceIsBliss: A character or characters are told that what they are doing is something completely harmless or beneficial when it's actually dangerous or evil.
* InfractionDistraction: When someone confesses to or commits a small crime in order to cover for a bigger one.
* MoveAlongNothingToSeeHere: A {{stock phrase}} for authority figures wanting to prevent people from seeing something.
* MysteriousBacker: The characters are only being told as much as they need to know.
* [[ILied Outright Lie]]: 'I am trustworthy', 'The Earth is mine to sell' -- both are falsehoods knowingly spoken with intent to deceive. This is the trademark of the ConMan and the [[ZanyScheme schemer]], resorted to by anyone covering up a BigSecret. However subtle they may be, PullTheThread and they collapse (which is why the liar often takes RefugeInAudacity, to keep someone from pulling the thread).
* PropagandaMachine: exists to make propaganda; publications geared to influence the public first & foremost, with journalistic integrity as an afterthought, if that.
* SeamlessSpontaneousLie: A quick, incredibly detailed and not easily disproved lie.
* SarcasticConfession: A truth that will not be believed. Often used to support the {{masquerade}}, this both deflects attention from the truth now and makes one less willing to accept the truth later.
* SureLetsGoWithThat: Alice confronts Bob, who is obviously hiding something, and she concludes something wildly different than the secret Bob is actually sitting on, but Bob confesses to Alice's accusation only because he's covering up something darker or just embarrassing.
* TruthTwister: "Looks are only skin-deep," "The Earth is doomed," "No one who has drunk my tonic has ever died" -- all carefully selected truths, intended to deceive, the hallmark of [[AdvertisingTropes advertisers]] and politicians. Expect anyone unable to lie whether due to magic, AppliedPhlebotinum, or just being a ManipulativeBastard type, to be good at this.
* UnusuallyUninterestingName: This innocent sounding group are not a secret organisation of any sort, you won't even question their involvement or even notice their existence. The name is likely to be technically correct though.
* YouDidntAsk: when a character simply doesn't tell/mention something that's particularly large, hard to avoid in conversation, or just really should have been mentioned.
* YouSaidYouWouldLetThemGo: A villain lies to someone to get them to go along with a plan that will ultimately hurt those that they care about, or otherwise makes a promise that he has no intention of keeping. Often involves use of loopholes.

!!Tropes of Lies
* AccidentalTruth
* ActingUnnatural
* AmnesiacLiar
* BackupBluff
* BadLiar
* BelievingTheirOwnLies
* BigSecret
* BlatantLies
** ItsForABook
** QuoteMine
** WeWereRehearsingAPlay
** WildCardExcuse
* BrandishmentBluff
* CannotTellALie
* ConsummateLiar
* ContrivedClumsiness
* DarkSecret
* DugInDeeper
** LanguageOfTruth
** WillNotTellALie
* DoubleSpeak
* EmptyPromise
* EngineeredHeroics
* EverybodyKnewAlready: Something you think is a secret, but really isn't.
* EyesNeverLie
* FakingAmnesia
* FictionNeverLies
* FriendshipDenial
* GodGuise
* GodNeverSaidThat
* HaveIMentionedIAmSexuallyActiveToday
* HesitationEqualsDishonesty
* IAmOneOfThoseToo: When you are caught in a lie by someone who just happens to have that ability / nationality for real.
* IWasNeverHere
* ImplausibleDeniability
* InfauxmationDesk: Index of assorted means of deception
* InflationaryDialogue
* TheInnerReveal
* InternalRetcon
* InventionPretension
* KeepingSecretsSucks: Because it involves lying a whole lot.
* LetThemDieHappy
* LiarRevealed
* LiesDamnedLiesAndStatistics
* LiesToChildren
* LivingLieDetector
* LyingCreator
* LyingFingerCross
* LyingToProtectYourFeelings
* LyingToThePerp
* MaliciousSlander
* MemoryGambit: Making yourself believe your lies just to regain memory after everyone else starts believing them.
* MetaphoricallyTrue
* MockMillionaire
* MotivationalLie
* TheMunchausen
* MunchausenSyndrome
* NarrativeBackpedaling
* NoTrueScotsman
* TheOldestTricksInTheBook
* ObstructiveVigilantism: Lying to the cops for the greater good. Or not.
* OpenSecret: When everyone acts like something is supposed to be a secret, but everybody knows about it anyway.
* PhonyVeteran
* PinocchioNose
* PlagiarismInFiction
* ThePowerOfLegacy
* RecruitersAlwaysLie
* SecretlyWealthy
* SelfProclaimedLiar
* TheShadowKnows
* SnowballLie
** InventedIndividual
* StereoFibbing
* SuspiciouslySpecificDenial
* ThatLiarLies
* TotemPoleTrench
* TwoFacedAside
* UnreliableExpositor
* UnreliableNarrator
* UnreliableVoiceover
* WeDoNotKnowEachOther
* YouCanAlwaysTellALiar
* YouWontFeelAThing
[[/index]]
Finally, remember this is just the start. Deception can be layered on deception, true lies cloaking misleading truths, until not even the trickster can tell which way up is.

See also InformationDesk, about tropes whose truthfulness or dishonesty is not guaranteed; InfauxmationDesk, about false information; and ATrustingIndex, which is about tropes regarding trust.
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