History Main / ThoughtTheyKnewAlready

* The crew in ''Literature/TheBandsOfMourning'' are after the titular Bands, legendary artifacts held by the deceased [[GodEmperor Lord Ruler]], which are hidden in a temple. Allik Neverfar, who shares a religion with the people who built the temple, reveals that the Bands were created by a god from their lands who came to theirs after his death. Coupled with the fact that [[NoTimeToExplain Allik can't use his]] TranslatorMicrobes at the same time as his lifesaving heating device, they don't discuss the topic long enough for them to realize that [[spoiler:his Sovereign isn't their Lord Ruler. Allik knows that they're separate people, but not the epithet the Sovereign held in their lands: Kelsier, the Survivor]].

* ''VideoGame/HaloCombatEvolved'': 343 Guilty Spark tells Master Chief that activating Halo will destroy the [[TheVirus Flood]] that are overwhelming the structure. Cortana stops Chief just before he does this because she has found out that "stopping the Flood" more specifically means "wiping out all lifeforms in the galaxy that could be used as Flood hosts". Guilty Spark, when confronted about this, admits that he thought Master Chief and the other "Reclaimers" already this would happen and wouldn't have any reason to hesitate.

Subtrope of SayingTooMuch. Sister trope to YouKnowWhatYouDid, YouDidntAsk and YouJustToldMe. Often results in NiceJobBreakingItHero or NiceJobFixingItVillain. Compare and contrast IllNeverTellYouWhatImTellingYou. See also AccidentalConfession, EverybodyKnewAlready and PoorCommunicationKills.

Subtrope of SayingTooMuch. Sister trope to YouKnowWhatYouDid, YouDidntAsk and YouJustToldMe. Often results in NiceJobBreakingItHero or NiceJobFixingItVillain. Compare and contrast IllNeverTellYouWhatImTellingYou. See also EverybodyKnewAlready and PoorCommunicationKills.

* ''WebAnimation/{{RWBY}}'': In Volume 8, [[PsychoSupporter Tyrian]] is surprised to discover that Emerald and Mercury genuinely had no idea what Salem's true endgame was, [[VillainHasAPoint remarking]] it should have been obvious from the second they met her. [[spoiler:To wit, Emerald, Mercury, and Hazel all believed Salem merely planned to conquer Remnant, only for Ozpin to clarify, and Tyrian to confirm, that she actually plans to destroy it outright.]]

[[folder:Web Comics]]

'''Sonic''': I thought it was obvious. I can't help it if [[IdiotBall you're slow]].

* ''Manga/FruitsBasket'': This is the head maid's justification for [[PoorCommunicationKills not bothering]] to tell anyone that the box she gave Akito to comfort her over her father's death was empty; she believed it was obvious and anyone could have figured it out on their own. Unfortunately, Ren, Akito's [[PsychopathicManchild mentally unstable]] AbusiveMom, ''didn't'' figure it out, became convinced that it contained a treasure of Akira's, and went to incredible lengths to steal it from Akito on the grounds that [[EntitledToHaveYou anything Akira owned is rightfully hers]]. When the truth is revealed, the other maids immediately call the head maid out over not telling everyone, let alone giving Akito the box to begin with, but even then, the head maid defends her actions.
-->'''Maid''': ''Anyone'' would have realized it was empty! That's just common sense!

* ''WesternAnimation/DuckTales2017'': Ludwig von Drake's reaction to everyone's shock at the bombshell [[spoiler: that Webby is Scrooge's OppositeSexClone.]]

* ''Webcomic/KhaosKomix'': Unknown to her, Charlie is outed as {{Transgender}} to her boyfriend Jamie when her mother talks to him about her past TransTribulations. PlayedForDrama as he acts as SecretSecretKeeper for most of a chapter while Charlie struggles with how to come out to [[TroubledSympatheticBigot him]].

* This is how Tidus finds out the AwfulTruth that [[spoiler:Yuna will die at the end of her pilgrimage]] in ''Videogame/FinalFantasyX''.

* ''WesternAnimation/TheIncredibles'': After making a new suit for Bob, Edna makes suits for the whole Parr family and shows them to Helen, inadvertently revealing to her that Bob has been doing superhero work behind her back. Edna says, "I assumed you knew, [[WhatTheHellIsThatAccent dahling]]. Why would he keep secrets from you?"\\

* ''WesternAnimation/TheIncredibles'': After making a new suit for Bob, Edna makes suits for the whole Parr family and shows them to Helen, inadvertently revealing to her that Bob has been doing superhero work behind her back. Edna says, "I assumed you knew, [[WhatTheHellIsThatAccent dahling]]. Why would he keep secrets from you?"

* While very different fics, both ''Fanfic/AvengersOfSteel'' and ''Fanfic/InfinityCrisis'' have a running theme in Thor (and other Asgardians) being under the mistaken impression Earth is aware of various cosmic/fantastic stuff (a long-ago war of dragons, the Infinity Stones, the existence of Atlantis and the Savage Land) and thus never feel the need to bring up what they assume is "common knowledge."

* ''VideoGame/{{Octodad}}'': In the last level of ''Dadliest Catch'', Stacy is the only person to recognize Octodad without his trademark [[NiceSuit blue suit,]] and she inadvertently reveals his secret to Scarlet and Tommy.

* ''VideoGame/Octodad'': In the last level of ''Dadliest Catch'', Stacy is the only person to recognize Octodad without his trademark [[NiceSuit blue suit,]] and she inadvertently reveals his secret to Scarlet and Tommy.

* ''WesternAnimation/KingOfTheHill'': It's an extremely obvious OpenSecret that Nancy Gribble is cheating on her husband Dale with John Redcorn, which led to the birth of [[ChocolateBaby Joseph]]. As it turns out, [[KnowNothingKnowItAll Peggy]] legitimately didn't know about this until over a decade after Joseph was born, and only after Hank all but flat-out told her when he realized her obliviousness to the fact. When Peggy demands to know why Hank never said anything about it before, he admits that he thought she knew already, since ''everyone'' who knows the Gribble family is aware of it (except, ironically, for Dale and Joseph themselves).

* ''WesternAnimation/KingOfTheHill'': It's an extremely obvious OpenSecret that [[YourCheatingHeart Nancy Gribble is cheating on her husband Dale with John Redcorn]], which led to the birth of [[ChocolateBaby Joseph]]. As it turns out, [[KnowNothingKnowItAll Peggy]] legitimately didn't know about this until over a decade after Joseph was born, and only after Hank all but flat-out told her when he realized her obliviousness to the fact. When Peggy demands to know why Hank never said anything about it before, he admits that he thought she knew already, since ''everyone'' who knows the Gribble family is aware of it (except, ironically, for Dale and Joseph themselves).