As an actor, if you step to the side and you look at [Thornton's performance] technically, and you try to imagine doing what he was doing, most people would panic. Most people would be on the set, and they would be panicking, going, "I'm not doing anything!" All the ham instincts in you would be screaming, "You've got to indicate something here." And it's beautiful, in a way. And so I appreciate, even as an audience member, the courage that it takes to be... frankly, to be subtle.

I do subscribe to the maxim that generally comedy is like jazz. Either you get it or you don't. You can't learn it and you can't be taught it. I don't think that if you are not a funny person, you can fake it.

I've never acted before in a movie I've directed. This felt like the time to do it just because the " Leaves of Grass" movie itself is so much of a platform for the lead actor. It's really written for an exciting performance and it really depends on the audience watching an extraordinary actor having a great time pulling off this feat. It makes sense to me as a director to act in support of that.

What we set out to do with this movie [Leaves of Grass] was to create something that was funny and serious and had large tonal ambitions. A movie that could be poignant and funny, and suddenly quite violent. To have a character utterly sideswiped, and to learn that life is about balance.

The film industry needs to confront the physical footprint of the way films get made.

As an actor, I don't have any politics. As an actor, I'm driven more by an authentic - I would say an obsessive-compulsive-disorder level-fixation on mimicry, tonality of voice, to literally imitate something until I can just disappear into it.

For me there's always a line or two in a script, when you hit it you almost decide to do the whole movie off a line or two. You almost do it for the fun of getting to say a line or two like that. I don't have any specific plans, you know. I mean, if Seth Rogen calls with a great buddy pic, I'll be there.