Larry comes home to find a gorilla on his roof.

After calling several animal control numbers in the phone book, he finally calls a man who thinks he can handle this gorilla.
The man arrives at the house in a white pickup truck with his dog in the passenger seat and a rifle in the back.
He hands the rifle to Larry and says "So here's what we're gonna do: I'm going to climb up onto your roof and scare the gorilla off. Once he hits the ground, I've trained my dog to go bite his nuts and shake them until the gorilla passes out. After that I'll load him up and go release him in the hills."
Larry thinks about it and decides the plan isn't half bad and may actually work.
"But why'd you give me the rifle?"
"If I fall off the roof, shoot the dog."