Put some mousetraps on the floor. Make sure they are new, clean ones. Give a player a fishing pole with a stuffed mouse or rubber frog or anything creepy thing you can pick up at the local costumer and trinket shop. They try to fling the mouse out and catch a trap. If they're really good they can get more than one. Have them stand about 6 feet away from the nearest trap. Keep young one away from traps at all times!