3 stocking caps, duct tape, M&M's, glow-in-the-dark objects
Place a stocking cap on three kids' heads then wrap with duct tape, sticky side out. Have them wheel barrow to vacuum the room with their head. You could also use M&M's that you have "accidentally" dropped. Variation: Put down a lot of glow-in-the-dark objects, then turn out the lights and let them collect. The darker the better.
2 months ago