A rabbi who was walking through a small town saw a blackboard outside the side door of a school. It had just been washed and put out to dry in the open air. There was a piece of chalk in the tray of the blackboard, so the rabbi took it and wrote in large letters, "I'm a rabbi and I pray for you all."

Now a lawyer happened to pass soon, and when he saw the rabbi's note, he added under it, "I'm a lawyer and I defend you all."

Then a doctor came by, took the piece of chalk and wrote on the blackboard, "I'm a doctor and I cure you all."

Finally an ordinary citizen stopped to read the growing list, thought for a few seconds and then added, "I'm just your average guy, and I pay for you all."