Here.

Q. What is the etiquette of turning off a tv in a public place?

A. TV-B-Gone(TM) universal remote control is capable of turning off virtually any remotely controlled tv. Since a tv that is powered on fills the room with its sights and sounds, impinging on everyone in the room, it is similar to a smoker who fills a room with smoke. Some people may like breathing in someone else's smoke, but that's not for everyone. Similarly, not everyone wants to be disturbed with someone else's media. If someone were smoking a cigar in a public place and you were disturbed by it, you would probably either leave, or you would ask them if they would mind putting it out. Similarly, if someone is filling your space with disturbing sights and sounds of a tv, you have the same choices. With TV-B-Gone(TM) universal remote control, you also have the power to turn the tv off with others' approval.

I approve. Might be fun at, like, the Sony Metreon. Somebody get one.