You have to be quite stupid to act.

That was me under the bath and the water being held down. The director wanted it to look as real as possible so he told Keanu, in front of me, don't go easy on her. So it was scary.

And I guess, I guess it's a humanist film. It's not really a spiritual film and it's, you know, it's saying that we're all one tribe of humans and we're on this little rock, floating through the universe and (Amenabar) has these (transitional shots of) POVs where you see humans like ants.

We're on this rock and we can choose to treat each other well or we can choose to kill each other and be uncivilized. I don't know. It's very tragic. It's a very tragic thing to think about.

Seeing someone you know be good at something is really appealing. Seeing how Darren Aronofsky behaved on set, it was another aspect of him, the director. He'd never directed me at home in the kitchen before. It was just seeing a whole other aspect of someone. It was really, really exciting. I loved it.

My real fantasy if I was to drop out would be to live in a mobile home and be a hippie and drive around festivals and have millions of children - children with dreadlocks and nose rings - and play the flute.

Eccentricity is what's sexy in people.