a small platform for players to stand on (usu. about 2x2 or 3x3, depending on group size); a small tarp can be used as well
Explain to players that they must all get off the ground quick! (Make up a scenario-lava, quicksand, poison peanut butter…) Their only hope is this platform. They can save themselves if they can put all their weight on this platform and stay there for a specified length of time (3 seconds, sing "Row, Row, Row Your Boat", …)
Players must figure out how best to accomplish this task on their own by working together.