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.
“At the ballet, you really feel like you're in the presence of something outside the rest of your life. Higher than the rest of your life.”
“God would not give us the same talent if what were right for men were wrong for women.”