I could never sit down and say: I'm going to do an out-and-out comedy, just to prove to people I can. You've just got to do what you do. Just listen to your soul and do your art and do it for the right reasons, and then you can't fail.

All you've got to do is turn up and have a few facial tics and be a lunatic and throw someone around the room or blow their brains out and people think it's good acting.

The thing is, if I try to talk about acting, I come off as moaning. But I'm privileged. I think it's all about control. Acting is vulnerable because you're not in control of anything. You have to give up a lot of your trust; it's up to somebody else what they do with what you've given them.

Its different being a director. I suppose, especially if its a story youve written and you feel compelled to tell, in some ways its a lot easier than acting because youre orchestrating the piece. As an actor, sometimes youre trying to second-guess what people want.

When you're having conversations about actors, you realize these same conversations have happened about you. If you want to make a film for $5m, then you cast A, B and C, but if you want $20m, you won't be able to cast them, you need X, Y and Z.

You walk past people in streets, or they serve you in shops, and you know nothing about the horrors they may be living with.

With directors, some have a kind of in-built ability to just know how to work with actors and get the best out of actors, and some don't have a clue about acting. I think it'd be a good idea if directors put themselves in front of the camera, or even went on a six-week drama course, just to know a little bit about what that feels like.