This takes about 5 campers and is done like this. There is a chief who is handing out forks spoons and knives and plates.
The first camper goes "Can I get a fork please?" The chief replies "Sure here you go." Then the camper goes "How did you get it so clean?" The chief says "River water."
You do this with at least 3 more campers using different objects(forks spoons knives plates)when you finish that one more camper says "May I have a fork?" The chief says "I have to clean some first."
The chief yells "River water!" and a dog comes up and licks all the silverware. All the campers act sick.