A homeowner notices there's a gorilla in the tree in his front yard. So he calls animal control. Animal control arrives and hops out his van with a chihuahua, handcuffs, a stick and a shotgun.
Homeowner asks "How are we going to get this gorilla outta here?"
Animal control "What I'm going to do is, climb the tree and poke the gorilla with my stick when he falls my trained chihuahua will run after his nuts, when the gorilla goes to cover his jewels, you place the handcuffs on him and I'll take him away."
"Ok, sounds easy enough" says the homeowner. "But what's the shotgun for?"
Animal control "Well, in case I fall first, shoot the dog."