A lot of the films I like are more than fantasies - they're movies fascinated by the technology of space exploration, and they try to honor the laws of physics. I watched the Gregory Peck movie 'Marooned' over and over when I was a kid.

I'm very aware that the future of any film is not necessarily the theatrical experience, it's the home video experience because that is the one that is going to be presented for years to come. So you want to make sure that you push your movie, but you're talking about a movie that you finished months ago. And your head is trying to move into new grounds and you're still pushing for the other one. That's the tough element of it.

Every film is difficult. Making films, you're always going to have problems, there's always going to be challenges.

I have this thing that, once I finish a movie, I never see it again.

Y Tu Mama Tambien' is one of the first unrated movies to be nominated for an Academy Award for Best Original Screenplay. But many video stores won't take a movie that's not rated, so I had to make the movie an R.

Historically, there is a fight between the sound designer and the composer. You see them in the mixing room and they're always fighting because the composer wants the music to be heard and the sound designer wants the sound to be heard.

I'm interested in new worlds, new universes, new challenges. I always said the only reason to make a film is not for the result but for what you learn for the next one.