Have a camper (Igor) stand in front of the audience and three others stand aside.
The 1st camper walks up to Igor and Igor asks if he wants to buy brains. Campers asks for some candy and he yells “GO AWAY!”
The 2nd camper walks up to Igor and Igor asks if he wants brains. Camper asks for soda (any brand) and Igor yells at him too.
The 3rd camper walks up and Igor asks if he wants brains. He agrees.
Igor shows him a Scout’s brain (imaginary) and says, “camper brain, 1 dolla’, camp counselor, 5 dolla'” He continues up and keeps raising the price all the way to Camp Director’s brain for $1,000,000.
The 3rd camper asks, “Why is this one so high??”
Igor says, “‘Cause it’s never been used!!”