A famous psychiatrist was being interviewed by a television interviewer.
“Doctor, how can you tell if a person is really insane?”
“It’s simple. I just ask the sort of questions that any sane person can answer without any difficulty.”
“What type of question! Give me an example.”
“This sort of thing,” replied the psychiatrist. “Captain Cook made three voyages around the world. He died in one of his voyages. Which one was it?”
“But to answer that,” said the interviewer, “You’d need to be good at history.”