I bristle a little when the argument for film gets put into the nostalgia ghetto. Film is still the highest quality and best-looking image capture medium available. I don't think it always will be. The digital image will get better, and it will eventually surpass the quality of the film image, but it isn't there yet.

You come out of each movie just thinking, "God, if we can fool them into letting us make just one more, we can get it right."

That's part of the appeal of time-travel movies: The notion of going back and fixing something.

Teen movies often have an unspoken underlying premise in which high school is seen as less serious than the adult world. But when your head is encased in that microcosm it's the most serious time of your life.

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.

Memory is a form of time travel. That's something we do during the course of the day, every single day. The idea of actually being able to physically adjust that and change it instead of being haunted by it is a really human thing.

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.