You always hope that the cloak of inspiration will fall, and you'll be O.K.

What other people think of me is none of my business.

Impressionists have to paint with a very broad stroke because you've got to see it within a couple of seconds. You go, "That's a really funny Robert De Niro." As an actor, though, you look at different aspects of a character. I try to completely surround myself with the assignment. It's like being in a big cloud and then some of it rains through.

You take what you know, and you put it through your own prism. If I play characters that break down or cry, it's Gary Oldman crying; it's not the character crying.

It's always hard when you're playing someone for a lot of people out there who are going to see the movie after reading the books. There's a communion between a reader and the writer, so people will have an idea who Sirius Black is and I might not be everyone's idea of that.

My passion and energy get mistaken for anger.

Rather like Batman, I embody the themes of the movie which are the values of family, courage and compassion and a sense of right and wrong, good and bad and justice.