A novel and clever way of getting people to behave at the movies:
http://www.bbc.co.uk/news/entertainment-arts-19622445
I think one of the biggest reasons people -- especially people who are normally reasonable and well-mannered -- misbehave in certain specific situations, like at cinemas and behind the wheel, is because they think they won't be held accountable. There's a veneer of anonymity that strips away self-consciousness of, and shame about, bad behaviours. Having "etiquette ninjas" point out their rudeness instantly draws attention to the wrongdoer as a misbehaving individual, in a public setting where people don't want to be embarrassed. It's an excellent way of bringing those civilizing qualities back, with humor and style.