I'm obviously very keen on the theater and I think it's inevitable that some of the orchestral and chamber pieces have got dramatic elements which might even suggest an unspecified dramatic plot of some kind or other, even though it's not in my mind at the time.
A joke is not a thing but a process, a trick you play on the listener's mind. You start him off toward a plausible goal, and then by a sudden twist you land him nowhere at all or just where he didn't expect to go.