In the happy scenes there were really fun times. Sean would say really funny stuff because he likes to improv. I would want to laugh, but you are not allowed to do that during the take.
Actors who say they can dive inside a character are either schizophrenic or lying.
I like to rehearse with the actors scenes that are not in the script and will not be in the film because what we're really doing is trying to establish their character, and good acting to me is about reacting.