A lot of times in life, lots of people jump to conclusions about certain kinds of things. After a little bit of misunderstanding, once a character finds out what's really going on, he will then proclaim rather [[{{Blatant Lies}} blatantly]] that he knew it all along.

A {{Comedy}} trope that you can expect to see in media, and I knew it all the time.

See also IMeantToDoThat and GladIThoughtOfIt. For when people ''actually'' knew it all along, see EverybodyKnewAlready.

Not to be confused with {{I Knew It}}, an {{Audience Reaction}}.
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!!Examples:

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[[folder: Anime and Manga ]]

* After the first stage of the Chuunin exams in ''Manga/{{Naruto}}'', Proctor Ibiki explained that there were two members of the test takers who served as cheating fodder for the others, which several shinobi noticed, but Naruto was not among them. However, once Ibiki explains this, Naruto acts as if he figured it out halfway through.
* In ''Anime/PrettyCureAllStars DX 3'', [[Anime/HeartcatchPrettyCure Cure Marine]] and [[Anime/SuitePrettyCure Cure Rhythm]] start panicking when [[Anime/FutariWaPrettyCure Cure White]], [[Anime/FutariWaPrettyCureSplashStar Cure Egret]], [[Anime/YesPrettyCure5 Cure Mint, Cure Aqua]], and [[Anime/FreshPrettyCure Cure Berry]] start taunting Freezer and Frozen. When it turns out that their taunting leads the two to freeze the water they were trapped around, Marine instantly declares that it was a great plan and she knew it all along. The others don't buy it.

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[[folder: Comic Books ]]

* In the DonaldDuck comic [[CarlBarks "The Old Castle's Secret"]], after the "ghost" is revealed to be [[spoiler:a guy using invisibility spray]], Donald tries to claim he knew it all along (rather than being terrified out of his wits while Huey, Dewey and Louie single-handedly solved the mystery themselves). His nephews are not amused.

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[[folder: Film ]]

* In ''Disney/TheLittleMermaid'', this was Scuttle's response after Sebastian tells him that Ariel had gotten legs (Scuttle knew that something was different about Ariel, but kept guessing right off the bat that it was something else).
* {{The Fugitive}} (1993): The U.S. Marshals are listening to the tape of Kimble's phone call to his lawyer. Several of them say they think that a sound on the tape is made by an elevated train, but Gerard disagrees and sarcastically abuses them. As they continue to analyze the tape they realize that Kimble was calling from Chicago near an elevated train line.
-->'''Gerard''': I knew it was an elevated train.
* ''Film/TheLandBeforeTime'': After Cera was cornered by a pack of Pachycephalosauruses that were scared off by a seemingly monstrous tar blob monster, she becomes afraid that the monster will get her too. However, the monster turns out to be Littlefoot and the others all covered with tar. Once Cera realizes this, she then proclaims that she knew all along that it was them.
* Lynch, Bud Fox's boss in ''WallStreet'', tells him "The minute I laid eyes on you I knew you had what it took," when Bud's star is rising. When Bud is arrested, Lynch has his own personal {{retcon}}, saying, "The minute I laid eyes on you I knew you were no good."
* In ''Film/HarryPotter [[Literature/HarryPotterAndTheChamberOfSecrets and the Chamber Of Secrets]]'', Professor [[KnowNothingKnowItAll Lockhart]] claimed, after Professor Snape hit him with a disarming spell during a demonstration, [[SuspiciouslySpecificDenial to have known what Snape was going to do, and that if he wanted to block it he could have.]]
** When Harry and Ron are hiding in the teachers' room and someone suggests a remedy for the students' petrification, Lockhart is heard to mumble something along the lines of "Of course, it's what I've been saying all along."
** Harry always assumed that Malfoy was working with the Death Eaters in ''Literature/HarryPotterAndTheHalfBloodPrince'', in the end he was right. Except that Draco didn't exactly enjoy being a Death Eater.
* C-3PO says the line verbatim in ''TheEmpireStrikesBack'', claiming he knew all along that Lando Calrissian was [[ReverseMole really on their side]]. Of course, this seems more like wishful thinking that just happened to be correct, since 3PO was already having a pretty bad day what with being dismembered and carried around on Chewie's back like a bookbag, and he really wanted to catch some kind of break.

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[[folder: Newspaper Comics ]]

* Rat in [[http://www.gocomics.com/pearlsbeforeswine/2011/12/21 this]] recent ''PearlsBeforeSwine'' comic.
* {{Garfield}} did this lots of times, especially in [[http://garfield.nfshost.com/1989/09/06/ this]] strip.

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[[folder: Literature ]]

* AmeliaPeabody and her husband Emerson both like to claim to be better at detective work than they actually are:
** In ''The Curse of the Pharaohs'', most of the "deductions" Emerson claims to have made were actually things he had no idea about until the killer confessed.
** In ''The Deeds of the Disturber'', Amelia gives TheSummation to their assembled friends, explaining why one person and one person only could be the mastermind behind the murders. When she and Emerson are in bed together later, however, they both confess that they had both suspected the wrong person right up until TheReveal.

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[[folder: Live-Action TV ]]

* ''Series/BuffyTheVampireSlayer'': Willow, on learning of Xander and Cordy's makeouts.
-->'''Willow''': I knew it! Well, not in the sense that I actually knew anything, but you two were arguing way too much!

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[[folder: Fan Works ]]

* Played for laughs in [[http://www.youtube.com/watch?v=E5Uu0dyH9CU this video]] where someone plays ''VideoGame/KirbySuperStar'' and is terrified of [[ZeroEffortBoss Waddle Dee]]. A bystanding StraightMan makes some rational observations on him, all dismissed by the player as "Lies!" The friend eventually tells the player how to get Kirby to properly attack (to which the player expresses amazement), and once Waddle Dee finally dies, the player exclaims, "It worked! I'm a genius!"

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[[folder: Webcomics ]]

* [[http://www.shortpacked.com/2008/08/26 This guy]] in ''Webcomic/{{Shortpacked}}''.

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[[folder: Western Animation ]]

* Woofer on ''ClueClub'' always brags to Wimper of how he knew who the mystery's culprit was and his modus operandi.
* In the ''ScoobyDooWhereAreYou'' episode "Never Ape an Ape Man", Shaggy gets "grabbed" by a stuffed ape. Upon being told this, he says, "Well, I certainly hope you don't think he had me fooled for a minute. I knew it all the time." Scooby sees right through him.
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