I like his response regarding strong AI. The idea that it is a moving target might have been expressed before, but I thought he formulated it very well:

"The funny thing about AI is that it’s a moving target. In the seventies, someone might ask “what are the goals of AI?” And you might say, “Oh, we want a computer who can beat a chess master, or who can understand actual language speech, or who can search a whole database very quickly.” We do all that now, like face recognition. All these things that we thought were AI, we can do them. But once you do them, you don’t think of them as AI."