Pie are not square. Pie are round. Cornbread are square. Dennis Healy, Dartmouth A doctor, a lawyer and a mathematician were discussing the relative merits of having a wife or a mistress. If you have a wife and want a divorce, it causes all sorts of legal problems.
Algebraists do it in groups.
Al Sethuraman, Calma Company, San Diego Von Neumann and Nobert Weiner were both the subject of many dotty professor stories. One time one of his students tried to get more helpful information by asking if there was another way to solve the problem. Weiner was in fact very absent minded. Since she was certain that he would forget that they had moved and where they had moved to, she wrote down the new address on a piece of paper, and gave it to him. Naturally, in the course of the day, an insight occurred to him.