This guy wakes up one morning to find a huge male silverback gorilla in a tree in his backyard. This seemed strange since gorillas are not native to the area, so he calls the zoo. They explain the gorilla just escaped from the zoo and they were sending over an expert to bring the gorilla back to the zoo.
An hour later a man shows up with a shotgun, a stick, a pit bull and a set of large handcuffs.
He hands the homeowner the handcuffs and the shotgun and then gives the man some instructions. "Now, I'm going to climb this tree and poke the gorilla with the stick until he falls. When he does, the trained pit bull will bite the gorilla's balls. The gorilla will then cross his hands to protect himself and allow you to put the handcuffs on."
The man asks, "What do I do with the shotgun?"
The zoo guy explains, "If I fall out of the tree before the gorilla, shoot the dog!"