I did have a knack for playing weirdos. There's still sort of this perception of me out there as being this crazy guy.

I like celluloid, I like film, I like the way that when a movie is projected it sort of breathes a little in the gate. That's the magic of it to me.

For a year, I had all sorts of weirdos coming on to me.

I got obsessed with classical music, I got obsessed with Chopin, with playing the piano.

I still don't have a publicist. If I'm in a film, you have an obligation to promote it, I'll do as much as I can.

And of course I've got kids of my own now, and they love me being in the Harry Potter films. I'm now part of a phenomenon. You become incredibly cool to your kids, and you get a young fan base. So you became the cool dad at school. You're suddenly hip.