Four or five scouts
One scout kneels on all fours – he is the lawnmower. Another scout says, “I have to get this old lawnmower started so I can cut the grass, then go camping with the troop (pack).” He pulls on the cord, the lawnmower sputters, but it does not start.
The other scouts, who are watching, volunteer to give it a try, but with the same negative results. The first scout asks a member of the audience (preferably a leader) to give it a try. The person does, and the lawnmower starts on the first pull.
The first scout then says, “I guess all it needed was a big jerk!”