->'''Mullroy:''' I think he's telling the truth.\\
'''Murtogg:''' If he were telling the truth, he wouldn't have told us.\\
'''Captain Jack Sparrow:''' Unless, of course, he knew you wouldn't believe the truth even if he told it to you.
-->-- ''Film/PiratesOfTheCaribbeanTheCurseOfTheBlackPearl''

A StockPhrase. [[AliceAndBob Alice]] has just done something/been somewhere/went on a crazy adventure, and Bob asks her about it, usually with "Where Were You?" Rather than boring the audience with the story, or using a quick Fade Out-Fade In to skip it, Alice simply says "You Wouldn't Believe Me If I Told You..."

And ItsALongStory, anyway...

A common variation (or addition) is: "I wouldn't believe it myself if I hadn't seen/lived/heard/witnessed/experienced it." And as the examples show, there are several permutations of this sentiment. In short, it's the way a character avoids the CassandraTruth situation.

The opposite is CassandraTruth, where Alice ''does'' tell Bob, and Bob doesn't buy it. Likewise, contrast to YouHaveToBelieveMe, where someone tells the truth while making it sound as crazy as possible. Related is SarcasticConfession, where Alice tells Bob in a sarcastic manner to prevent him from taking it seriously. Contrast SuspiciouslySpecificDenial.


[[folder:Anime & Manga]]
* While never actually said in ''Anime/CodeGeass'', this trope is the likely reason why Lelouch never explains to Suzaku that his Geassing of [[spoiler:Euphemia]] was an accident.
* A major plot of ''[[Anime/MobileFighterGGundam G Gundam]]'' is that Kyoji made a clone of himself with all of his knowledge and skills in order to protect his brother Domon as he was currently under the control of the Dark Gundam and incapable of helping Domon himself. When asked by Domon why he didn't reveal this secret earlier, Kyoji's clone states, "You were so hot-headed back then, Domon; you wouldn't have believed me if I had told you."
* In ''Anime/DigimonTamers'', the Tamers would try to keep the Digimon secret from their parents as they wouldn't believe them.
* In ''Anime/PuellaMagiMadokaMagica'', this is the reason Homura gives as to why she never told anyone about the terrible secrets behind Magical Girls. [[spoiler:And she knows this for a fact: in previous timelines, she ''did'' try telling her friends, but they never believed her.]]

[[folder:Fan Fiction]]
* In ''Fanfic/KyonBigDamnHero'', after [[VisualNovel/HigurashiWhenTheyCry Rika Fuurude]] convinces [[LightNovel/HaruhiSuzumiya Kyon]], [[spoiler:her nephew]], to trust her and tell her his story about the supernatural by her telling him her [[AnyoneCanDie own]] [[GroundhogDayLoop supernatural]] [[EverybodyLives experiences]] he explains that his adventures, while true, are still difficult to believe.
-->'''Kyon:''' (through ManlyTears) I...it's... It's nothing nearly that bad. I wouldn't... You may still think I'm crazy, and... Well, parts of this are secrets I don't really tell anyone else, but...
* In ''FanFic/{{Insomnia}}'', Link acts on this trope's principle whenever he shrugs off Tatl's attempts of uncovering his backstory.
* In ''Fanfic/{{Intercom}}'', Riley uses this to avoid telling her parents about being able to hear her emotions' voices.

* [=IMDb=] [[http://www.imdb.com/search/text?realm=title&field=quotes&q=You+wouldn%27t+believe+me+if+I+told+you Search Quotes for "You wouldn't believe me if I told you".]] The phrase (or a reasonable variation thereof) appears in (among others):
** ''Good Will Hunting''
** ''Film/TheHamiltons''
** ''ComicStrip/DickTracy vs. Cueball'' (1946)
** ''The Enforcer''
** ''ForrestGump''
** ''Today You Die''
** ''Pure Country''
* Played with in ''Film/TheLionTheWitchAndTheWardrobe'' when the Professor finds the kids just as they return through the wardrobe from Narnia after spending years there. When they give his stock line, the Professor (who went to Narnia himself as a boy) playfully responds, "Try me."
* ''Film/TheFinalCountdown'' uses the, "They're never going to believe it," variation as the USS ''Nimitz'' is returning to Pearl Harbor, having just spent about a week in 1941 thanks to TimeTravel.
* In ''Film/TheWizardOfOz'' when Glinda tells Dorothy at the end that the ruby slippers can take her home, Dorothy asks why Glinda didn't tell her at the beginning, and Glinda says "You wouldn't have believed me." This is actually a patch for an AdaptationInducedPlotHole. In the book, the Good Witches are two different people, and the Witch of the North actually didn't ''know'' the slippers could get Dorothy home, while Glinda was the Witch of the South, who ''did'' know.

* There's a joke about an elephant that runs away from the circus and ends up in the garden of an old woman who's never seen an elephant in her life. She, naturally, calls the police.
-->'''Old woman:''' ...and he's pulling out my carrots with his tail!
-->'''Cop:''' "...carrots with tail." Rrrright. What does he do with them after he's pulled them out?
-->'''Old woman:''' ...Officer, [[AssShove if I told you, you wouldn't believe me]]!

[[folder:Live Action TV]]
* In ''Series/PushingDaisies'', Chuck tells Ned that Olive wouldn't believe that Ned had brought Chuck back to life even if she told her. Ned asks her how she knows that, and she says, "because I told her and she wouldn't believe me."
* ''Series/{{Bewitched}}'' episode "Daddy Comes to Visit"
* ''Series/WarOfTheWorlds'' episode "The Resurrection"
* Used in ''Series/{{Buffy|TheVampireSlayer}}'''s second season finale, after ''Spike'' has offered to help her prevent the apocalypse.
* At the end of the classic ''Series/DoctorWho'' episode "The Three Doctors", a man is zapped back to his small English village after being accidentally sucked into one of the show's typical plots. His wife appears and starts peppering him with questions about where he disappeared to. He listens stoically, then grunts "You'd never believe me, woman. Supper ready?" and stomps into his house.
** It's also a common reply by the Doctor himself in regards to questions like "How did you get here?", "How do you know that?", "What makes you think our benevolent leader (who is actually The Master) is up to something bad?" and so on. The few times he does tell, people predictably don't believe him.
** Subverted in "Death in Heaven". When Osgood asks who "Missy" is, the Doctor uses this line - except Osgood's already guessed that she's the latest incarnation of TheMaster. "That was fairly quick."
* Used by Richard in the ''Series/{{Lost}}'' episode "Dr. Linus"; like the Professor above, Jack responds "Try me," as a) he has been through an awful lot of weird shit, and b) he is getting a bit sick of people dodging questions.
* In an episode of ''Series/FullHouse,'' Jesse receives some timely advice from a man who looks like (though hinted it might be) Music/ElvisPresley, and when Jesse mentions he looks familiar, the stranger says people mistake him for Wayne Newton. When Jesse is telling everyone else about the stranger, he realizes that being a huge Elvis fan, it was just too weird that he got advice from a man who looked like Elvis, so he said the man looked like Wayne Newton.
* ''Series/SoRandom'': Rufus's CatchPhrase is "Oh, you're not going to believe this." Naturally, every word he says is true, no matter how ridiculous.
* ''Series/{{Sliders}}'' had this nearly every episode, when they had to convince people in whatever AlternateUniverse they were visiting of where they came from.
* ''Series/EarlyEdition'' had this fairly often too, when Gary Hobson, a man who gets tomorrow's newspaper today, is asked how he knows that things are going to happen before they do.

* A variation: In Literature/TheBible, Luke 22, the arrested Jesus is interrogated and asked to confirm that he claims to be the Christ. He answers with pretty much this phrase. If Our Lord being a DeadpanSnarker distresses you, wait 'til you find the puns.
* A slight variation is said by Shay Bourne to Father Michael in Jodi Picoult's ''Change of Heart'':
-->They moved to the far side of the room, and I leaned closer to Shay.
-->"Are you okay?"
-->"You wouldn't believe it if I told you."
-->"Oh, try me."
* Happens in ''Literature/TheDresdenFiles'' novel ''Changes'', where the [[GoodCopBadCop Good Cop]] is questioning Harry about a building that was bombed. Harry delivers this line when asked if he knows who did it, then the two change subject and talk a while before the cop decides he's innocent and lets him go. Before Harry leaves, the cop asks who really did it, to which he responds "Vampires," adding "I told you you wouldn't believe me" a minute later when the cop goes through surprise and disbelief.
** Note that said cop was a LivingLieDetector, so he realizes Harry actually believes his answer is the truth.
* In ''[[Literature/{{Ravirn}} WebMage]]'', Ravirn is placed under a "Cassandra Curse" that prevents people from believing anything he says about the BigBad. When Eris tries to question him about a related matter, he tells her that she wouldn't believe him if he told her -- [[CassandraTruth which she naturally doesn't believe]].
* In ''The Gatekeeper: The Gate Contracts'', George Green has to explain to his boss what happened with Lynn in the Men's restroom:
-->'''Dr. Sign''': Okay George, let's hear it.\\
'''George''': Lynn and I went to the cafeteria to eat. I told her to wait a minute, I had to use the bathroom. I went in and used the urinal as someone else came into the bathroom. When I turned around I discovered that she was the someone else. She proceeded to make various cooing sounds and I attempted to tell her this was inappropriate. She unzipped my fly, removed my penis from my pants and got on her knees. I put my hands on her shoulders in an attempt to push her away. At that moment the [campus police] officer came into the bathroom." I smiled a little. "I'm sorry, Dr. Sign, I shouldn't be smiling about this. I know this is serious, but I got a mental picture in my head of what he saw and trying to explain to him it wasn't what he thought it was. I looked at what was happening. I said to the officer that I wasn't going to say a word to him, if I was him and I told him what I know, I wouldn't have believed it either.

[[folder:Video Games]]
* At the end of ''VideoGame/ConkersBadFurDay'' (And the remake.) Conker says this exact line to the bartender when asked "Ya look horrible! what happened to you?" Before being poured a glass of scotch and asking for the whole bottle.
* The player can invoke this in ''VideoGame/MissionCritical'' after waking up with the first officer of the USS Lexington angry, holding a sidearm on them, and demanding answers. It goes about as well as one would expect.
--->'''Player:''' You won't believe a word.
--->'''Tran:''' Try me.
--->''*Tell her everything that's happened, including [[spoiler: [[TheMole the traitor aboard the ship]], the UNS ambush and resulting death of everyone else on board both ships, the destruction of the [[LostTechnology alien ruins]] on the planet, the resulting loss of the war, TimeTravel, [[TheEndOfTheWorldAsWeKnowIt the end of all known space]] due to a later RobotWar ([[SubvertedTrope started]] by [[HumansAreTheRealMonsters the humans]]), and the [[SlidingScaleOfRobotIntelligence sentient AIs]] who sent you back [[SetRightWhatOnceWentWrong to prevent it]].]]*''
--->'''Tran:''' That is the most ridiculous story I've heard since I graduated from the naval academy.
** Which raises the question, ''[[NoodleIncident what the hell story did they tell her back in naval academy?]]''
* At the beginning of the Warden's Keep DLC for ''VideoGame/DragonAgeOrigins'', you can ask Levi Dryden how he was able to pick his way through a series of mountain tunnels to Solider's Peak. He utters this phrase in response, but when you press him, he reveals that it came to him in a dream. It turns out to be true; that was how the [[BloodMagic mage]] Avernus [[TalkingInYourDreams reached out to Levi]], encouraging him to search the (not entirely) abandoned fortress.
* In ''VideoGame/KingsQuestVAbsenceMakesTheHeartGoYonder'', Graham gets carried away by a giant Roc and is only barely rescued from being eaten by its young by a friendly eagle, who deposits him on a beach. When Cedric asks where Graham went, he responds with the trope name.
** Which is rather odd, seeing as in that game alone he dealt with genies, witches, magic ice queens, elves, gnomes, talking animals and trees, yetis and [[ArsonMurderAndJaywalking gypsies]]. But getting carried away by a giant bird is apparently [[ArbitrarySkepticism too much to believe.]]
* During the final level of Crysis Nomad finally meets with Psycho again, who had been supporting him throughout the game up until they were separated, and sees that he has secured an alien life-form for the U.S Navy to study. Nomad asks Psycho how he got the alien off the island and onto a Naval vessel Psycho responds saying, "Long story. You wouldn't believe me if I told you." However there was a DLC for the original PC version where we do in fact see how Psycho got it.
* In ''VideoGame/{{Persona 4}}'', this trope is the reason why the [[AmateurSleuth Investigation Team]] (a [[RagtagBunchOfMisfits ragtag group of high school kids]]) can't turn to the police for help. [[spoiler: Which is proven true late in the game when the Protagonist gets hauled off to Police Station by Dojima (his uncle and a detective) after receiving a threat letter in the mail.]]

[[folder:Western Animation]]
%%* ''WesternAnimation/{{Doug}}'' episode "Doug Takes the Case/Doug's Secret Song"
%%* ''SinbadLegendOfTheSevenSeas''
* ''WesternAnimation/ScoobyDooAndTheGoblinKing''. At the end of the episode, the [[spoiler:benevolent]] Goblin King casts a spell that erases memory of the night's events from everyone but Shaggy and Scooby. When the rest of the gang asks what happened, they use the trope.
* In the ''WesternAnimation/JusticeLeagueUnlimited'' episode "Double Date", Green Arrow asks [[CloudCuckoolander The Question]] why he's helping [[VigilanteMan Huntress]] track down the man who killed her parents. Question responds with this, and everyone just assumes he says it because his motives are something insane. (It turns out he's just trying to impress Huntress.)
* In ''WesternAnimation/TheLegendOfKorra'', [[LargeHam Bumi]], known for his tall tales, delivers this line almost word for word after single-handedly destroying an entire Water Tribe encampment with little more than a [[https://www.youtube.com/watch?v=KFfdfsPKEYY flute and pure guile.]]
* ''[[WesternAnimation/TeenageMutantNinjaTurtles2003 TMNT (2003)]]'': In [[Recap/TeenageMutantNinjaTurtles2003S1E3AttackOfTheMousers "Attack of the Mousers,"]] Master Splinter is (understandably) afraid that April O'Neil will tell people about the existence of himself and his four sons, but April points out that even if she did tell anyone, they probably wouldn't believe her--even Leo and Mikey agree that April does have a point.
* One sketch on ''WesternAnimation/RobotChicken'' features pee building up outside of a plane, and freezing in the cold air. It keeps building up and getting bigger until it forms a giant frozen piss-ball and breaks off, plummeting to Earth and ultimately crushing the British royal family. The headline simply read, "You're Not Going To [[PrecisionFStrike Fucking]] Believe This!"