I have an overactive brain, and as a result of that, I can really get in my own mind. So I like to try and exercise it to the point of exhaustion.

As Uta Hagen would say, there's the representational actor and the presentational actor. My sister [Maggie Gyllenhaal] came up to me recently after she saw this movie, Southpaw, the movie I did, and she thought there was this exploration of that type of presentation, and a bit of representation as well, if I could be totally honest, where she was deeply moved.

We are all from different cultures. Heath's [Ledger] Australian, really. I'm from here. Ang's [Lee] from China. But I think Ang gets very close in preproduction and rehearsals. And then he allows his actors - I don't think scared of actors, but I think he's scared of getting in on the scenes he's watching. The space he's watching. So he just totally disconnects from you while you're shooting.

Do I take care of my body and take conditioning seriously? Yes.

They're the darkest people I know, comedians.

Uta Hagen would say, there's the representational actor and the presentational actor.

There's no shame in somebody who doesn't necessarily do that job knowing a little bit more in that instance than you might know about your own job, you know, and I think that is where movies are such a collaborative art form.