Bubba & Earl went moose hunting every year without success.
Finally, they came up with a foolproof plan. They got a very authentic female moose costume and learned the mating call of a female moose. The plan was to hide in the costume, Bubba at the front and Earl at the rear. They would then lure the bull in and jump out out of the costume to shoot the bull.
They set themselves up on the edge of a clearing, donned their costume, moved into their tent and began to give the moose love call. Before long, their call was answered as a bull came crashing out of the forest and into the clearing.
When the bull was close enough, Bubba said, "Okay, lets get out and get him."
After a moment that seemed like an eternity, Earl shouted, "The zipper is stuck! What are we going to do!?"
Bubba says, "Well, I'm going to start nibbling grass, but you'd better brace yourself."