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Sometimes I go to a test screening and look at the audience in line, and I start to go, "Okay, I bet this is going to work, and this isn't going to work." It's weird, but just going and facing the music and putting it out before a crowd, even before it starts playing, that exercise of putting it up on a screen for people makes you realize things even before it starts rolling. It's really weird. I've heard other people say that, too.

Source: film.avclub.com
Sometimes I go to a test screening and look at the audience in line, and I start to go, Okay, I bet this is going to work, and this isn't going to work. It's weird, but just going and facing the music and putting it out