A noted psychiatrist was a guest at a blonde gathering, and his hostess
naturally broached the subject in which the doctor was most at ease.
"Would you mind telling me, Doctor," she asked, "how you detect a mental
deficiency in somebody who appears completely normal?"
easier," he replied.
"You ask a simple question which anyone should
answer with no trouble. If he hesitates, that puts you on the track."
"What sort of question?"
"Well, you might ask him, 'Captain Cook made
three trips around the world and died during one of them. Which one?'
The blonde thought a moment, then said with a nervous laugh, "You
wouldn't happen to have another example would you? I must confess I
don't know much about history."