What roles by actors/actresses have been PERFECTLY cast?

[Sussudio]

What actors/actresses do you think have been perfectly cast in movies (or tv)?

I think the respective directors and/or casting directors nailed it when they cast Hugh Jackman as Wolverine, Robert Downey Jr. as Iron Man, and Tony Shalhoub as Monk, to name a few. I couldn't see anyone else playing their characters. And of course I have to throw in Christian Bale, who pulled off the best psycho I've ever seen