A man calls the Animal Control in his town, because there is a crazed gorilla on
his roof, and he can't figure out how to get it down safely.
Soon, a van pulls up, and an old man gets out, carrying a small dog, a baseball
bat, and a gun.
He hands the man the gun. "Okay, here's what we do. I'm going to go up onto
your roof, and threaten the gorilla with this baseball bat until he falls down.
When he falls down, this little dog is specially trained to bite him on the
balls until he's incapacitated." "Great plan," says the man. "But what's the
gun for?" "If I fall down instead of the gorilla -- shoot the dog."