A game warden sped up to a man peacefully fishing in his boat where a sign read "No Fishing."

"Don't you see the no fishing sign?" asked the game warden.

"Yes, I see it," the man said calmly.

"Do you know I can fine you for breaking the law?" the warden asked angrily.

"But sir, I am not breaking the law," the man declared.

"If you are not fishing, then what are you doing?" the warden asked sarcastically.

"Well, I am teaching my worm how to swim!"