Anything that あなた 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 映画 on テレビ または from a $5 DVD <Yes, there is such a thing. As a result, the restriction is "Whatever my フレンズ and I don't pay for at the movies, I can't watch"
Well, I don't actually run around telling my parents 映画 I wanna see または I've already seen. And if I do, they're not really into this whole 'I know what that movie is about and あなた 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 表示する now and there's nothing they can do about it xDD