A Chauffeur Delivered His Boss's Nobel Lecture Perfectly, Until One Question Exposed Him

After winning the Nobel Prize in 1918 for showing that energy comes in tiny discrete bursts, German theoretical physicist Max Planck did what prizewinners did. He went on tour, stopping at campuses and meeting halls across the country to lecture on his findings.

Night after night, the same man heard it again. Planck's chauffeur heard the talk in rehearsal and in performance so many times that he had the entire thing memorized.

The tale, which writer Sahil Bloom says he first found in a transcript of a 2007 graduation address by investor Charlie Munger at the University of Southern California law school, is almost certainly embellished. But it contains a lesson about the difference between knowing something and sounding as if you do.

At the final stop, the chauffeur made a joking proposal. Let him borrow the suit and give the talk in Planck's place. To his surprise, Planck agreed.

The substitute walked to the front of the room and was flawless. He repeated the lecture exactly as Planck gave it. The audience heard a perfect Nobel lecture from a man who had only memorized it.

Then came the turn. A member of the audience asked a simple follow-up question, and the speaker was completely stumped.

Thinking fast, the chauffeur answered, "That question is so easy, I'll let my chauffeur answer it." He pointed to the back of the room, where Planck stood smiling in the driver's cap.

The lesson is the gap between memorizing and understanding. Genuine mastery is pliable. A person who has earned it through years of practice can stretch it to answer something new. A memorized performance cannot. It can sound polished enough to impress guests at dinner or get through a simple test, but it cracks when pressed. The chauffeur had the performance down cold. He did not have the understanding to handle the one thing he had not rehearsed, an unscripted question from a listener.