let my chauffeur answer it

Albert Einstein was getting bored with making the same speech over and over again at different meetings, so one night, after a long day, his chauffeur jokingly said, "I've heard your speech so many times, I know it word for word! Why don't you take the night off and let me deliver the talk this evening?" Einstein agreed.

When they arrived at the venue, Einstein put on the chauffeur's uniform and hat, and sat at the back of the hall while the chauffeur took his place on the podium, effortlessly delivering the speech, then inviting the audience to ask questions.

He convincingly answered the first few, but then one pompous man stood up and asked a very difficult question on his theories of relativity.

The chauffeur was flummoxed, but calmly said, "Why, that question is so very easy, I will let my chauffeur answer it!"