"Dad, who built the Suez Canal?"

"I don't know, son."

"Dad, who discovered penicillin?"

"I've no idea, son."

"Dad, what's the capital of Italy?"

"I ain't got a clue, son."

"Dad, you don't mind me asking all these questions do you?"

"Of course not, son. If you don't ask, you won't learn anything."