I really enjoy playing villains, whether they're realistic like Switchblade Sam or whether they're a bit more over-the-top like Kruge in 'Star Trek III' or Judge Doom in 'Who Framed Roger Rabbit.' It's sort of a license just to be as bad as the script allows you to be - you can just go for it and have fun.
'Hamlet' was the first movie I saw. In 1948, my mother said, 'I'm going to take you to see 'Hamlet' with Laurence Olivier.' She was worried about taking me to it because she wasn't sure I was old enough to understand it or to maybe be adversely affected by it, but I got recordings of it and memorized all the soliloquies.