Walken is one of those actors, Gene Hackman is another IMO, who is always watchable no matter what the film. I think it's a combination of attitude and also great skill as an actor. The Fat Boy Slim video was jaw-dropping, although I recently read that Walken was a dancer before he got into film which makes it slightly less surprising.

I can't recall the name of the film, but he freaked me out in the one with Sean Penn and Madonna's song Live to Tell. Worst father ever, TM.