Put about 10 pennies inside several clean soda cans and seal them with tape. Line the cans up on the edge of a counter about 6 inches apart. Put a piece of food, or napkins, or whatever it is that he grabs off the table BEHIND the cans. When the booby trap is all set up, leave the room, but stay within earshot. When you hear the can hit the ground, come running in screaming.