You get a group of 4 or 5 people in a line. One person is a show manager. The line walks around. The show manager anounces the marvelous caterpillar. They catepillar walks in. The manager says certain tricks and the catepiller does them (make a triangle, square, etc.) Then call for a volunteer for the best and last trick. (Make sure they aren't easily angered) Have the volunteer lay on the ground. Then say the marvolous catepillar will walk over the volunteer. Have each member of the catepillar walk over the volunteer, but have the last one dump a cup of water on the person (they pick up the cup secretly when the volunteer is walking up).