->''"This information would have been useful'' '''''a few years ago!'''''
->''"You never tell me '''anything''', so how the '''hell''' should I know what might be important?"''
-->-- '''Sticks and Michael''', ''Webcomic/{{SSDD}}''

This is when someone knows a fact that would be of great importance to the heroes but never says anything, for the simple reason that that person has ''no idea'' the fact is important. A subtrope of PoorCommunicationKills, and definitely overlaps with LockedOutOfTheLoop.

Compare and contrast YouDidntAsk, which is where the person who knows the clue also knows its importance, but simply wasn't asked to divulge.

----
!!Examples

[[foldercontrol]]

[[folder: Fanfiction ]]

* In ''FanFic/SayItThrice'', [[WesternAnimation/DannyPhantom Danny, Sam, and Tucker]] never think to mention to the new girl about the rumors concerning the Ghost With the Most and his missing "Mortal Bride." Likewise, [[Film/{{Beetlejuice}} Lydia]] never thinks to mention she was almost married to a ghost once. Without these minor details, no one can make the connection and realize they are dealing with the same entity. Of course, it makes sense that the topics wouldn't come up when talking to near-strangers.

[[/folder]]

[[folder: Film - Live-Action ]]

* In ''Film/ThePrincessBride'', Inigo Montoya can be forgiven for not realising that a wheelbarrow might turn out to be of significance:
-->'''Westley:''' What are our liabilities?\\
'''Inigo:''' There is but one working castle gate, and... and it is guarded by 60 men.\\
'''Westley:''' And our assets?\\
'''Inigo:''' Your brains, Fezzik's strength, my steel.\\
'''Westley:''' I mean, if we only had a wheelbarrow, that would be something.\\
'''Inigo:''' Where did we put that wheelbarrow the albino had?\\
'''Fezzik:''' Over the albino, I think.\\
'''Westley:''' Well, why didn't you list that among our assets in the first place?

[[/folder]]

[[folder: Literature ]]

* [[Literature/{{Discworld}} Vimes]] has a moment or two of this in every book he stars in, but ''Discworld/FeetOfClay'' and ''Discworld/{{Thud}}'' probably have the most.
* In the ''Literature/DanteValentine'' series, Danny is forever begging Japhrimel to tell her things. He doesn't until it comes up in battle. When Danny asks why he didn't tell her sooner, he shrugs it off answering, "I did not want to trouble you with something so trivial." He abuses this excuse to the point Dante is often ready to scream.
* The crucial clue that Literature/HerculePoirot needs to solve the mystery is usually something like this. It's [[LampshadeHanging lampshaded]] in ''Literature/TheABCMurders'', when he summons the families of all of the victims precisely for the purpose of talking about the trivial things surrounding the murders, in hopes that there will be some small detail that connects all of them. [[spoiler: There is, but it turns out to be a RedHerring.]]

[[/folder]]

[[folder: Live-Action TV ]]

* It seems like in ''Series/{{House}}'' every other episode or so features this -- the key turns out to be something that the patient would have gladly divulged (especially as an alternative to the humiliating but irrelevant parts of his life that they unearth while looking for the clue), but couldn't see that it would possibly be relevant.
* In an episode of ''Series/LawAndOrderSpecialVictimsUnit'', Elliot is accused of murdering a suspect in custody when the man's spleen is found lacerated in an autopsy. When ME Warner, who performed the autopsy, goes to him to apologize for having to implicate him in the man's death, Elliot is horrified at his own actions and says he never meant for anyone to die; he tried to save the man. How? By performing CPR. Which Warner immediately realizes could have caused the injury, meaning his cause of death was something else. She didn't know he'd done it, and none of the people who had witnessed it realized it was relevant at all, let alone the difference between Elliot going free or being charged with murder.
* The ''Series/{{Columbo}}'' episode called "Lady In Waiting" has a wealthy woman kill her brother and make it look like she accidentally mistook him for a burglar after he tripped the alarm system. Her fiancé came to the house unexpectedly as her setup was unfolding. Only later did he realize (with Columbo's help) that [[spoiler:he heard the three fatal shots first, '''then''' heard the alarm sound]].
* In the season one episode of ''Series/{{Farscape}}'', "I, E.T.", the crew is desperately searching for an anesthesia to use on Moya located somewhere on an alien planet, only to find out, at the eleventh hour, from a befriended local that it's a common spice they used in their food.

[[/folder]]

[[folder: Video Games ]]

* ''VideoGame/Persona4'': Yukiko's knowledge that [[spoiler:Adachi]] was at the inn spending a lot of time with Ms. Yamano just before she died is the first non-circumstantial piece of evidence the group has towards finding out his identity as the true Killer, but she doesn't make this known unless the player casts suspicion on [[spoiler:Adachi]] in the first place... ''at the very end of the game''.
* In ''VideoGame/TalesOfVesperia'', Judith knew the truth about the blastia and how they were affecting the planet. Did she share any of this information? No. And when Rita and the others asks, "why didn't you say anything?" Judith's response (as seen during one of the private scenes between her and Rita) amounts to, "it didn't seem important at the time."
* This trope is pulled in spades in the ''Franchise/AceAttorney'' series, infuriating the player character to no end. Witnesses will sometimes not bother to tell the player a vital piece of information or give some important evidence that could help clear their name or solve the case because they feel the item/information has no bearings on the current situation.
** A particularly notable example is when Miles Edgeworth [[NotSoStoic completely loses his composure]] in ''[[OOCIsSeriousBusiness the middle of court]]'' over a playing card that Adrian Andrews has been absentmindedly toying with. She is genuinely confused when he demands to know where she got it and why she didn't tell anyone about it. [[spoiler:Turns out it's the calling card of an infamous assassin, which dramatically changes the case]].
* In ''VideoGame/TalesOfTheAbyss'', Jade deduced almost immediately that [[spoiler:the "Luke" he was traveling with was actually a replica of the real Luke.]] Jade didn't tell because doing so would have resulted in [[spoiler:massive amounts of existential angst on replica!Luke's part]] with no apparent beneficial trade-off. In hindsight, that wasn't the best decision. Revealing the truth would have stopped the BigBad's manipulations, even if Jade wasn't aware of them.
** Luke does this later on in the last third of the game when he neglects to tell the rest of the party [[spoiler: the local Deity had contacted him, warning him that the BigBad had captured it]]. This one can be chalked up to simple ignorance, as Luke had no idea what the message meant.

[[/folder]]

[[folder: Webcomics ]]

* In ''Webcomic/{{SSDD}}'', Michael is the only member of a group trying to prevent [[AIIsACrapshoot The Oracle]] from gaining control who is not from the BadFuture in which it has done so. He also knows that British Intelligence created something called the Echelon Plug-in (he was given a copy of it). Two problems. First, he's the group's ButtMonkey, so nobody else tells him anything, which means he has no idea what the Oracle is, never mind that it exists. Second, he's the group's ButtMonkey, so nobody listens to him, which means the others have no idea what The Echelon Plug-in is, never mind that it exists. [[spoiler:When they ''finally'' tell Michael about Oracle, Michael makes a comparison of the two programs and the others realize that the Oracle and Echelon Plug-in are ''one and the same''. In other words, the Oracle already exists in Michael's time, which explains a ''lot''.]] The page quote comes from this.
* Antimony Carver, from ''Webcomic/GunnerkriggCourt''. At the point of Chapter 33, she had enough information about [[spoiler:Jeanne, one of the Court's founders]], whose information was [[{{Unperson}} deliberately hidden or destroyed]]. This is even lampshaded at some point in Chapter 23 by Jones:
-->''"A lot of information about the origin of the Court has been lost or, in my opinion, deliberately hidden. If you have somehow come across information from that time, it could provide valuable insight. (...) However, such information is useless until properly investigated. When you feel you have uncovered the whole story, please, tell me about it."''
* In ''Webcomic/{{Galaxion}}'' Patty gets bitten by an alien bug. The team worries a bit, but soon lets it go in favour of more pressing concerns, but the fever she develops after a while is actually plot-important. (And how!)