A lap circle (also known as a Lap Sit or lap game) is an entertaining exercise in cooperation, trust and coordination.
A lap circle is formed by a number of people (the more the better) standing in a circle, shoulder to shoulder, all facing towards the center. The next step is for everyone to take a quarter turn to the left (or right) and then on a given command everyone sits on the lap of the person behind them. The end result is everyone is supporting someone and everyone is being supported by another.
Businesses sometimes use lap circles as a trust and team building exercise.
References
Lap circle Wikipedia(Text) CC BY-SA