This is a great attention getter in car parks. Drive your car by a person in a parking lot when he or she is coming or going. You’re sure to get a lot of friendly help telling you that you left your coffee cup on the roof of your car.
WHAT YOU NEED:
-Paper (or tin) coffee cup with a lid
HOW TO DO IT:
First, place the magnet inside the coffee cup. Next, put the coffee cup and lid on top of the car. Finally, drive to find an audience and watch them lose their marbles trying to warn you.