Ask a group of ten or thirteen people to form a tight circle. Have each person extend both hands into the center, and grasp the hand of two different people. When this is completed, the group must then untangle the knot they have created. Physical hand-to-hand contact may not be broken to untangle the knot. Grips may change and palms may pivot on one another, but contact must be maintained. If time is running out, the problem can be simplified by breaking one grip and asking the group to form a single line instead of a circle