Hetty was talking to her friend Sadie. “My son Moshe,” said Hetty proudly, “has master’s degrees in psychology, psychiatry and economics.”
“You must be proud of him,” said Sadie.
“Yes, I am,” replied Hetty. “He can’t get a job — but at least he knows why.”
From Oy! The Ultimate Book of Jewish Jokes, by David Minkoff