Since the day I finished shooting there's been at least one person come up to me every single day and then after the trailer came out, at least four. It's absolutely bizarre to me. This was before there was any systematic promotion of the movie. It's just completely nuts.

I like being meticulous and it's quite difficult as an actor to have that much control.

I aspire to be Jack Nicholson. I love his every single mannerism. I used to try and be him in virtually everything I did, I don't know why. I watched One Flew Over the Cuckoo's Nest when I was about 13, and I dressed like him. I tried to do his accent. I did everything like him. I think it kind of stuck with me.

I have been lucky, of course. Like, last year, if I went out, I'd have to fight to chat someone up. This year, I look exactly the same, which is really scruffy, and yet lots of people seem to have just changed their minds and decided I'm really sexy.

The script changed so much over seven months and just had loads and loads of re-writes. I tried to tailor things to what I was interested in, like the relationship with the dad changed quite a lot because I thought one of the things when you're a young guy one of your biggest fears is this irrational fear of walking in your dad's footsteps and living the same life as him. I thought, even if your dad's a good guy, you just want to assert your independence on everything and it causes these irrational sort of rages.

I got expelled from my school when I was 12; I was quite bad!

Honestly, I didn't think that I would be recognized so easily.