One person asks a volunteer from the crowd. An adult is best. Ask them to get down on all fours. The rest of the people in on the skit sit on chairs drinking cups of water.
The person who asked for a volunteer yells out “CLOSING TIME”. Each person places their cup of water on the volunteers’ back and walks away.
The leader can then have an auction with the crowd for how long they should keep the cups of water on the volunteers back.
Note: Keep the volunteer there long enough for the joke to be funny but not too long.