How about the two old men, one a retired professor of psychology and the other a retired professor of history...their wives had talked them into a two week stay at a hotel in the Catskills. They were sitting around on the porch of the hotel watching the sun set.
The professor of history said to the professor of psychology, "Have you read Marx?"
To which the professor of psychology said, . . . "Yes, I think it's the wicker chairs!"