There was only me and a stranger in the company elevator. He looked at me and said, "Young man, you have a lot of hair." I was a bit stunned: "Thank you?" He sighed: "When I was your age, I had even more hair than you. Now..." He touched his shiny bald head. I said, "Uncle, that's a symbol of wisdom." His eyes lit up: "Then are you willing to trade three centimeters of wisdom for my head's troubles?"