One of my favorite interview shows was Inside the Actor's Studio. James Lipton was a master interviewer, and really got the actors (and directors) to talk about their craft. And then he let some of the students ask questions. It was really interesting, and really gave me an understanding of how difficult acting could be. One of the most interesting things I heard came from Robert DeNiro (I think). He said something about acting being a profession, and to have a good performance, there are bad movies/scripts an actor needs do just to stay fresh for that better roll/script.