An old blacksmith realized he was soon going to quit working so hard.
He picked out a strong young man to become his apprentice. The old
fellow was crabby and exacting. "Don't ask me a lot of questions," he
told the boy. "Just do whatever I tell you to do."
One day the old blacksmith took an iron out of the forge and laid it on
the anvil. "Get the hammer over there," he said. "When I nod my head,
hit it real good and hard."
Now the town is looking for a new blacksmith.
You don't stop laughing because you grow old, you grow old because you stopped laughing.