I think it's possible to be too quick-witted, too smart to be an actor. You have to turn off a lot of your brain, in a way. When you see a fellow actor just missing it, it's hard to keep your mouth shut, but you have to. Or see a director so stupid he couldn't direct vomit into a paper bag. And he's in charge, and it's really hard to keep your mouth shut.

Interview in The Guardian (2011)