"According to Freud what's inbetween 4 and 6?" (He pronounced the German numbers fear and sex).
"I shall have to ponder," he replied.
At various times of the day he gave Harry convoluted explanations, always sent away by a shake of the head.
"Well, what is the answer?" enquired the vexed professor early the next day before work.
"The answer is fuenf,(five), old chap."
"You tricked me, some joke, very funny!"
The professor was not laughing but Harry Haller still laughs about it now.