Divide into two teams and have them line up. Tell each team the rules and give them each 2 minutes to create a strategy. Give the first player on each team a 24-inch length of rope. At the signal, the first players tie a knot (any kind) in one end of the rope, the second player on each team ties one near the first, and so on down the line. There should be one knot for each player on the team. After all the knots are tied and the number checked, it goes down the line again with each player untying a knot. First team to finish wins.