Two boys were fishing. One of them had a permit to fish, the other one didn't. Suddenly a gamekeeper ran to them from a bush. The lad with the permit cried loudly, dropped his fishing rod, and ran off at top speed. The gamekeeper started to chase him quickly. Then the boy was tired and stopped. The man took him by the arm and said: "Have you got a permit to fish?"
"Yes, of course," said the boy quietly.
"Have you? Then show it to me."
The boy drew the permit from his pocket. The man examined it and frowned.
"Why did you run when you had this permit?" he asked.
"To let the other boy get away," was the reply. "He didn't have any."