In films, you are a commodity. You are a look, something that the camera really likes, something that has struck an audience in a certain way. It's not really so much about transforming yourself the way actors do onstage. I think there's a difference between the skill of acting in movies and onstage.
Certain movies like 'Wag The Dog,' we used improv on every scene that we did. Pretty much, we would shoot from the script and then some stuff that we came up with in rehearsal, and then we'd have at least one or two takes where we completely went off the script and just flew by the seat of our pants.