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. This is something that a LargeHam, a SmallNameBigEgo, an IdiotHero, or a MilesGloriosus is expected to do.

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

Not to be confused with IKnewIt, an AudienceReaction.



[[folder:Anime & Manga]]
* After the first stage of the Chuunin exams in ''Manga/{{Naruto}}'', Proctor Ibiki explains that there are two members of the test takers who served as cheating fodder for the others, which several shinobi noticed, but Naruto is 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.

[[folder:Comic Books]]
* In the WesternAnimation/DonaldDuck comic [[Creator/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.

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

[[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!"

* 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).
* ''Film/TheFugitive'' (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.
* ''WesternAnimation/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, being the ego brat she is.
* Lynch, Bud Fox's boss in ''Film/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."
* ''Film/HarryPotter'':
** In ''Film/HarryPotterAndTheChamberOfSecrets'', Professor [[KnowNothingKnowItAll Lockhart]] claims, after Professor Snape hits 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."
* C-3PO says the line verbatim in ''Film/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.
* In ''Film/StageDoor'', Anthony Powell is a nervous wreck on opening night because Terry Randall, the actress he picked for the lead part of the show he's producing, has been terrible during rehearsals, and the only reason he cast her in the first place was because his mysterious benefactor insisted he cast her. When she ends up giving a brilliant performance opening night - due to circumstances he's entirely unaware of - Powell acts not only as if he knew Terry was going to be good all along, he also acts as if he always knew the benefactor was in fact Terry's father (who, ironically enough, was hoping she'd fail so she'd quit acting).

* 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.
* In ''Cards on the Table'', when Literature/HerculePoirot reveals the identity of the murderer, Ariadne Oliver, who by this point has accused just about everyone, declares that she'd always said they'd done it.

[[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 [[BelligerentSexualTension you two were arguing way too much!]]
* Most certainly ''NOT'' PlayedForLaughs in the ''Series/DoctorWho'' episode [[Recap/DoctorWhoS30E10Midnight Midnight]]. After claiming loudly and vocally that the Doctor was possessed by the entity and that he should be thrown out of the airlock, the mother weakly claims that she knew that it wasn't him all along. She wisely shuts up after the Doctor gives her a DeathGlare.

[[folder: Theatre]]
* In ''Theatre/RosencrantzAndGuildensternAreDead'', Rosencrantz thinks he hears music, but decides he must be imagining it. Guildenstern then tells an allogorical story about a man who sees a unicorn but doesn't believe it until other people also say they can see it (and the more people see it, the less fantastic they find it). By the time he's finished the story, Rosencrantz has decided "I knew all along it was a band." Guildenstern sarcastically echoes "He knew all along it was a band."

[[folder:Web Comics]]
* [[http://www.shortpacked.com/index.php?id=719 I-Knew-About-That-Before-Anyone-Else Man]] in ''Webcomic/{{Shortpacked}}''.

[[folder:Western Animation]]
* Woofer on ''WesternAnimation/ClueClub'' always brags to Wimper of how he knew who the mystery's culprit was and his modus operandi.
* In the ''WesternAnimation/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.
** Shaggy actually says this a lot in order to not look like a coward, even though they already know he is.