I mean as in them being scary, not the film....not gore n stuff, just performance hinting at an underlying madness that you would be very scared to meet in real life (I dont count the shining cos thats all about his descent into it....its not really character acting, it is the story)

1) Dennis Hopper In blue velvet
2) Ben Kingsley In S*** Beast
3) Joe Pesci in Goodfellas