[[quoteright:295:http://static.tvtropes.org/pmwiki/pub/images/Loose-Lips-Sink-Ships-Posters_4848.jpg]]

-->''Three can keep a secret, if two of them are dead.''
--->--'''Creator/BenjaminFranklin'''

When someone gives away sensitive information unintentionally because they can't keep it to themselves. The TropeNamer is the famous slogan from UsefulNotes/WorldWarII "Loose Lips Sink Ships".

Very much TruthInTelevision, and something constantly warned about in the armed forces around the world, as you can never tell when the person on the street you are talking to might secretly be an espionage agent.

Because TechnologyMarchesOn, it's even easier than ever to get people killed by running your mouth off, thanks to websites such as LiveJournal, {{Facebook}}, TVTropes, and ThatOtherWiki. Always beware that when you talk about something that is privileged or secret, you might as well be standing on a roof top with a big sign and a megaphone.

A real danger, even if you don't live in a CityOfSpies, particularly if you unwittingly work near TheMole or are the target of a HoneyTrap (a warning commonly given to members of the military when they are going out into town: [[TheSchlubPubSeductionDeduction "If a girl acts interested in you, and if you're ugly, then it's a trick."]])

When this is subverted, it can become FeedTheMole. A subtrope of SayingTooMuch.
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!!Examples

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[[folder:Films -- Animation]]
* ''Film/WhoFramedRogerRabbit'' has the main character asking a few too many people where the detective's office is, allowing the bad guys to figure out where he's going.
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[[folder:Films -- Live-Action]]
* ''TheSumOfAllFears'' movie has one nuclear scientist's mom giving away some information to Clark that allows him to find the terrorist's nuclear production area.
* Parodied in a flashback in ''{{Airplane}}'': The hero tells his girlfriend that he's going to be sent out on a mission soon. He then goes on to mention exactly where he's going, what he's going to be bombing, what time of day they'll be attacking, how high they'll be flying, and what direction they'll be coming in from. But he refuses to give her a rough estimate of when he'll be back from the mission, because that's classified.
* Briefly comes up in ''Film/WarGames'', after David and Jennifer find out they accidentally hacked into NORAD and almost caused ANuclearError. After Jennifer gives a speech about how they won't be suspected if they act normal:
-->'''Jennifer''': [[HypocriticalHumor Oh God, this is so unbelievable! Listen, do you think maybe I could call Michelle and tell her?]]\\
'''David''': NO, JENNIFER, DON'T CALL HER!\\
'''Jennifer''': Sorry. All right, I won't.
[[/folder]]

[[folder:Literature]]
* ''Literature/HarryPotter''
** Rubeus Hagrid in ''Literature/HarryPotterAndThePhilosophersStone'' does this several times. Trust him with your life, but not your secrets. The [[Film/HarryPotter movie version]] even gave him a CatchPhrase relating to this: "I shouldn'ta told ya that!"
** Bertha Jorkins in ''Literature/HarryPotterAndTheGobletOfFire'' is no better at keeping secrets than Hagrid. As Sirius says it once: "She was a bit dim, but she had an excellent memory for gossip. It used to get her into a lot of trouble; [[TooDumbToLive she never knew when to keep her mouth shut]]."
* ''[[http://www.kipling.org.uk/poems_kingsjest.htm The Ballad of the King's Jest]]'' by Creator/RudyardKipling, about a talkative man running into the Great Game and discovering that his boss in Kabul doesn't have so much patience that this could end well for him.
* ''Literature/ProfessorMmaasLecture'': Professor Soul's Second Assistant, a termite who is a born snitch--literally. He's been born with auditory organs all over his body and is constantly registering so much input that he feels a physical need to dump this baggage out of his memory onto a number of interested termites.
* In ''Literature/{{Noob}}'', [[ConMan Gaea]] had to stop playing her previous {{MMORPG}} because a friend of hers couldn't keep her mouth shut about the scams she was pulling on other players. That friend is playing her current MMORPG also, but Gaea's ManipulativeBastard habits where getting an embryonic OpenSecret status by the time they ran into each other, making the info less sensitive.
* Sarai in the second ''Literature/DaughterOfTheLioness'' book refuses to not speak out against the horrible injustices perpetrated by the Copper Isles' ruling family. The things she says are ''accurate'', but the Rittevons are notoriously paranoid and touchy and have already arrested one very popular nobleman for trying to tactfully suggest that they not be quite so brutal, so it's a really bad idea. She also tells members of her social circle where there are anti-listening spells, another unwise move.
* The undoing of more than one of Literature/{{Parker}}'s carefully planned heists in the novels of Richard Srak; usually to Parker's disgust..
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[[folder:Live-Action TV]]
* An episode of ''Series/{{ER}}'' has two nurses talking about the two children of a patient who had been in an accident comforting each other... which ended up leading to BrotherSisterIncest. Unfortunately, they unknowingly were walking past the patient's husband, leading to a near-shooting incident (the father managed to calm himself down and came clean about what he had nearly done). The doctors were not pleased about the violation of Patient-Doctor Confidentiality and the incident it nearly caused.
* ''Series/{{JAG}}'': In "People v. Rabb", when Admiral Chegwidden says that what he's about to say is sensitive, Bud replies that ''[[DiscussedTrope My loose lips will sink no ships]]''.
* Barbra Jean from ''Series/{{Reba}}'' has this reputation, and for good reason. Throughout the series, she's blabbed out things quite a few times, such as telling Reba's eldest daughter and son-in-law about her youngest daughter's decision to move in with Reba's ex-husband -- even after promising not to blab.
* ''Series/{{Justified}}:
** Boyd Crowder's latest heroin shipment was delayed and to placate his dealers he tells them that the shipment is arriving tomorrow evening. The next day one of the dealers is approached by a female junkie who offers to give him a blow job if he tells her when he will get new heroin. He obliges and sure enough Boyd's shipment is hijacked and the men guarding it are killed.
** One would think that a mob boss like Sammy Tonin knew how to keep his mouth shut about the murder he committed. However, Sammy has gone through a VillainousBreakdown and is high on drugs most of the time. He brag to his business partners about the murder and how he had help from a federal agent. One of those business partners gets arrested and trades that information to the cops.
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[[folder:Music]]
* "Secret" by The Pierces (which became the opening theme for ''PrettyLittleLiars'') paraphrases the quote at the top of the page: "Two can keep a secret if one of them is dead".
* "Loose lips sink ships" is in the chorus of "Slip Of The Lip" by Ratt.
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[[folder:New Media]]
* TheOtherWiki has [[http://en.wikipedia.org/wiki/Wikipedia:Wikipedia_is_in_the_real_world an entry]] explaining the dangers of putting sensitive information (or at least, information that can come back to bite you in the ass) on Wikipedia.
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[[folder:Video Games]]
* ''VideoGame/FalloutNewVegas'' includes propaganda that's related to the common loose lips sink ships posters. At Helios One, it includes the "telling your wife" scenario, and "telling your drinking buddies", showing the route on how information reaches the Chinese spies.
* ''VideoGame/MassEffect3'': The ''Alliance News Network'' twitter updates on the Reaper invasion of Earth, which included details on where civilians were able to get military protection so they could escape Earth. [[spoiler: Emily Wong]] realized too late that the Reapers had been reading the tweets to find out where the evacuation point was so they could attack it.
* ''VideoGame/BlazBlue'' has this trope used to rather devastating effect against its invoker. After a fight, [[BadBoss Hazama]] tells [[PluckyGirl Makoto]], in no uncertain terms, about [[MadScientist Relius Clover's]] "random and untoward" interest in her before making an attempt on her life (and [[HarmlessFreezing getting frozen by Jin for it]]). He ''really'' should have picked a better compliment in hindsight. [[labelnote:Why?]]Hazama sends Relius after Makoto, and he eventually 'escorts' Jin out of Ronin-gai as bait. Bang's keen-eyed disciple spots the masked creeper and reports to his superior, who passes the info to Makoto - with this informatnion and Relius' mention in the report on Noel, she [[TakeAThirdOption chooses to send Bang after Jin (and Relius) while she attends to Noel and]] [[HeroesLoveRedheads Tsubaki]]. The long-term consequences are still being explored, but without Relius to restrain her, [[SpannerInTheWorks Hazama's plans fell apart soon after]].[[/labelnote]]
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[[folder:Web Original]]
* ''DoctorHorriblesSingAlongBlog'': The eponymous IneffectualSympatheticVillain has a blog, which he uses to talk to his fans about various things he's done and his plans for future schemes. [[spoiler: This backfires on him in Act II when it turns out his viewing audience includes [[ArchEnemy Captain Hammer]] and the LAPD.]]
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[[folder:Western Animation]]
* The ''PrivateSnafu'' short "Spies": Snafu brags about how he'll never tell the secret information he knows, but he carelessly drops hints which are eagerly picked up by hidden spies.
* Creator/NormanMclaren of the NationalFilmBoardOfCanada was even less subtle in ''[[https://www.nfb.ca/film/keep_your_mouth_shut Keep Your Mouth Shut]]'' with a cackling Nazi skull thanking all the blabbermouths in Canada for giving away such good intelligence.
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[[folder:Real Life]]
* As mentioned above, the TropeNamer is the slogan from UsefulNotes/WorldWarII, reminding people to be careful what they talk about in public, lest Axis spies pick up valuable clues.
** Another poster showed a Nazi putting a puzzle together that said "The Convoy Sails for England Tonight". The caption was "bits of careless talk are pieced together by the enemy."
* "Journalist" Geraldo Rivera in early 2003, while Rivera was traveling with the 101st Airborne Division in Iraq during a Fox News broadcast, Rivera began to disclose an upcoming operation, even going so far as to draw a map in the sand for his audience. The military immediately issued a firm denunciation of his actions, saying it put the operation at risk, and nearly expelled Rivera from Iraq.
** [[http://www.thedailyshow.com/watch/tue-april-1-2003/cry-me-a-rivera Parodied]] by ''Series/TheDailyShow'', which saw this as Rivera getting overexcited about establishing his IntrepidReporter credentials.
--->'''Creator/StephenColbert:''' He's the only reporter out here who's got the cojones to walk it like he talks it! He can't be constrained by concern for the safety and security of men who have invited him to join them at great risk to both themselves and their military objective! If he gets everybody killed, so be it. He's not gonna pussy out.
* News of the impending attack on Goose Green during the Falklands War was released by the British government and broadcast on the BBC World Service while the troops were still advancing on the town (and hadn't yet been detected by the Argentinian forces).
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