A group of great scientists were playing hide-and-seek in heaven after their deaths. It was Einstein's turn to seek. He opened his eyes after counting to 100 and saw that everyone had hidden except Newton, who was still standing there.
Einstein walked over and said, "Newton, I've caught you."
Newton: "No, you didn't catch Newton."
Einstein: "If you're not Newton, then who are you?"
Newton: "Look at what's under my feet."
Einstein looked down and saw that Newton was standing on a square floor tile that was one meter long and one meter wide. He was puzzled.
Newton: "What's under my feet is a square meter, and I'm standing on it, so I am Newton/square meter. Therefore, you didn't catch Newton; you caught Pascal."