I love movies that make me cry, because they're tapping into a real emotion in me, and I always think afterwards: how did they do that?
Hopefully, as I get older in the business, I make my choices more accurately, and I perhaps know from either the script or the first meeting that it isn't going to work.
James Franco is a Method actor. I respect Method actors, but he never snapped out of character. Whenever we'd have to get in the ring for boxing scenes, and even during practice, the dude was full-on hitting me.

