Have five or six campers stand in a line, side to side, facing the audience. The end camper has a mouthfull of water, unknown to the audience. With the campers in position, the end camper (other end from the one with the water) announces that the group has figured out a new way to brush their teeth and conserve water and that the group will now demonstrate.
The first camper mimics brushing his teeth then taking a swig of water and swishing it around in his mouth. He then leans over to the next in line camper and pretends to spit the water into the campers ear. That camper then brushes his teeth, swishs and pretends to spit into the next in line campers ear. This continues to the last in line (the one with the mouthful of water) camper who brushes, swishes, and spits the water out on the ground!