You never want to make a "message movie," but you always want to be talking about something that you care about.

My favorite sci-fi always uses its hook to amplify some bigger theme or idea - some emotional thrust.

I feel like people want to be surprised when they get out of the movies. They want something thrown at them they didn't expect. They want stuff that reminds them of the feelings that you get when you're watching art house movies but with the fun of like a big summer movie. That's the goal, I guess.

Back before 'Brick,' I wrote a short film that I never ended up shooting: hit men in the present who work for a mob in the future who send their victims back in time. A guy is sent his future self, he lets him run, and the whole short was them chasing each other across the city. That sat in a drawer for 10 years until after I made 'Brothers Bloom.

I do love science fiction, but it's not really a genre unto itself; it always seems to merge with another genre. With the few movies I've done, I've ended up playing with genre in some way or another, so any genre that's made to mix with others is like candy to me. It allows you to use big, mythic situations to talk about ordinary things.

Unlike some of the time-travel movies I love, like 'Primer' or '12 Monkeys,' 'Looper' is not about time travel. It's about this situation that time travel creates and the people dealing with that situation. So narratively, the big challenge was to have time travel get out of the way.

When you're writing is when the "god should I just drop this" feeling can hit. When you're editing is when the "god this is awful and I've wasted everyone's time and money and will be revealed as a fraud" feeling can hit.