i loved natural born killers, but i thought it was kind of interesting to note that quentin tarantino insisted his name be removed from the film due to how much stone changed his original screenplay.
some more crazy movies: firecracker, starring mike patton. not very good, pretty awful actually. but definitely weird.
freaks!!! come on. gooble gobble gooble gobble, one of us. classic.
brazil. or any terry gilliam in general. the fisher king, 12 monkeys, etc.
i saw a movie recently called 'wristcutters: a love story', that's not terrible, but not so great either. BUT, it has tom waits in it. and that's enough for me.