There was a successful big game collector who was getting a bit on in years and decided to take on a younger partner. A zoo ordered a large male gorilla, so they packed up their gear and a large mean-looking dog.
Curious, the new guy asked what the dog was for, and his boss's reply was "Well, it works like this: you climb the tree the gorilla is in, and shake the branches. When the gorilla falls, ol' blue here runs up and grabs it by the cajones. This incapacitates the animal, and I crate it up."
"That's pretty cool...but what's the rifle for?"
"The rifle is just in case the gorilla doesn't cooperate and we get into trouble and have to shoot the beast."
So up the tree the newby climbs, but he miscalculates and loses his grip. On the way down, you could hear him yelling "Shoot the dog! Shoot the Dog!!!!"