Because I was always a fat child, I got fatter and fatter, and I ended up 18 stone and with a 40-inch waist.

In any kind of comic scene you're going to perhaps push the boundaries of plausibility but as long as there is some semblance of logic I think as an audience you'll buy it and as an actor, when it comes to playing things like that, it gives you something to delve into. When I don't buy into a comic scene is the type of scenario where you'd just go: "Well, that would never happen."

As an actor, you try and be cool, but one of the reasons you become an actor is because you're a film fan. And then you're like, 'Oh my god, Ridley Scott just spoke to me!'

My dad's one of the funniest men in the world. I grew up with him making me laugh so much I'd beg him to stop.

I've done loads of things people have never seen, dramas on BBC4 and plays upstairs at the Royal Court and the Bush, and because I didn't go to drama school, they gave me an education.

When you do a film, you get picked up in a car, lunch is free. Theatre is really hard, and you get absolutely no money.

Doing Prometheus was what you imagine being an actor is like when you're five. In a spacesuit, on another planet, getting killed by an alien. It was a real treat, it felt like being a part of movie history.