All teenagers want to rebel a little and break away. But I think you are always going to want to go back to your parents for that safety they provide.

When I was younger, I would mess about and have a laugh with everyone. I was doing Atonement when I was about 12, and as we went to do this very serious scene, the director Joe [Wright] came up to me ... I'd been giggling right up to the beginning of the take. And he came up to me and said, "Okay, you need to be serious now." I completely idolized him.

My whole life I try to make into a comedy, so it would be nice to see that onscreen.

When I can't get the character out of my head, and I'm in my bedroom and I start to actually act out the scenes that I've read in a script, I think okay, I really want to do this.

Ivo van Hove is directing The Crucible, and rehearses in quite an unusual way. We started rehearsals last week and dived straight into the first act, like, five minutes after we all turned up. No warm-ups. We were very intensely immersed in that whole world on day one. It was quite surreal because I've never done any theater before.

When I was younger and in primary school, I'd do maybe a film a year, and I had to adapt to being away from everyone for a couple of months.

When I am on set or rehearsing for the play, the only thing I can talk about is the work I'm doing. In that way, I home in on what I am doing at the time. So maybe I am a terrible multitasker.