[on playing children's writer Erich Kästner] The problem was: I have never smoked in my life, I had never liked the taste. In the beginning we tried using herbal cigarettes, but that didn't really work out. Later my cigarettes contained a light tobacco. And then, at some point, what happened was that I also lit up a cigarette when I wasn't being filmed. I was extremely shocked when I noticed this and I stopped it again real quickly.