I hated improvisation because in my early days as an actor, improvisation meant somebody had just come down from Oxford and they were doing a play above a pub in Kentish Town, and the biggest ego would win.
I went to art school in the days when it was what you did if you didn't want to be like everybody else. You wanted to be strange and different, and art school encouraged that. We hated the drama students - they were guys with pipes and cardigans.