I think it's useful, as a famous person, to have as little separation between the perception of you and how you really are - because otherwise I'd be sitting here thinking I'm keeping secrets, and wondering when you're going to find out.

When I get into trouble at school I'd like to take an invisibility cloak, drape it over me and sneak out the door. Or I'd like to have a 3 headed-dog because then no one would argue with me.

For ages, in my lunch hours, I would just go round and choreograph fight scenes. For fun. So now I'm very good at being thrown around. I bounce, in the words of my friends.

My preparation is mainly just knowing the lines and getting in and knowing where your character is, knowing what it's about and having ideas that you can put in on the day.

I don't think that you necessarily need a certain type of background to take on roles. You see actors from very, very privileged backgrounds playing working class characters and vice-versa. I don't think your background limits you as to what you can do.

Some actresses are just insane. I've never worked with a nasty actress - they're all absolutely delightful. But completely barking.

My favorite phrase, that a friend of mine who worked on the Potter films and was a lot older than me would use in front of me, and I picked up from him many great phrases - the English have a lot of great idioms for sweating. I don't know why that is. But that's what we do. I feel like it's particularly our country; probably everywhere has a lot of idioms for sweating. He always said, "I'm sweating like a glassblower's asshole," which I always found an incredibly strange and yet vivid image.