Anything that 你 have to pay right away. Chinese people are cheap XD ...But seriously, they don't really care what I watch. They do prefer I watch 电影院 on 电视 或者 from a $5 DVD <Yes, there is such a thing. As a result, the restriction is "Whatever my 老友记 and I don't pay for at the movies, I can't watch"
Well, I don't actually run around telling my parents 电影院 I wanna see 或者 I've already seen. And if I do, they're not really into this whole 'I know what that movie is about and 你 won't see it', as long as I'm ok with it, they're too.
Although, there was a time when my dad didn't want to let me watch 'Bones'. At the time when I watched it at Rete4, it was classified as something appropriate for those older than 18. And since I'm 15, he would say 'It's not for you' and blah blah blah. I'm rewatching the whole 显示 now and there's nothing they can do about it xDD