Two scouts stand facing each other.
One scout puts their open hands, palms up, under the hands of the other scout, palms down.
The scout underneath tries to flip one (or both) of his hands over and onto the back of his opponent's hand (or hands) before the opponent can pull out of the way.
If he succeeds and slaps the hand, they repeat in the same positions.
If he misses, they switch positions and repeat.

Play continues until something more fun is thought up.