In the editing room, 20 percent of the time you're using stuff from before the actor knew the camera was rolling or you're taking a line from somewhere else and putting it in his mouth.
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If you're playing a good guy, you show some darkness. If you're playing a dark guy, you show something different, like humor, that will mix it up and hopefully surpass the audience's expectations. What I'm battling all the time is complacency in the audience. I try to bring a little mystery to what might happen because that engages people more.