I decided long ago that I hate everyone in the theatre except me when I saw Seven years ago, and these teenage boys starting laughing hysterically at the part where the man has just screwed the prostitute with that strap on of death. I may be over sensitive, but I'm pretty sure that wasn't meant to be funny, and if I were those boys-- Aaak, just went to the bad place.

Pretty much made me eye any teenage boys in every movie I've ever been to since then, and then I sit far far away from them.