Tags: Launching soon, if nobody has any objectionsWhen someone gives away sensitive information unintentionally because they can't keep it to themselves. The Trope Namer is the famous slogan from World War II "Lose Lips Sink Ships". Very much Truth in Television, 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 The Spy. Due to the fact that Technology Marches On, it's even easier than ever to get people killed by running your mouth off, thanks to websites such as LiveJournal, Face Book, TV Tropes, and That Other Wiki. 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 City of Spies, particularly if you unwittingly work near The Mole or are the target of a Honey Trap (A warning commonly given to members of the military when they are going out into town: "If a girl acts interested in you, and if you're ugly, then it's a trick." When this is subverted, it can become Feed the Mole.
- An episode of ER had two nurses talking about the two children of a patient who had been in an accident comforting each other... which ended up leading to Brother-Sister Incest. 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.
- The Other Wiki has 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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