LED Throwie

This is an idea from Graffiti Research Lab and is pretty clever. All it involves is a battery, an LED, some tape, and a small powerful magnet. All that you need to do is connect the battery to the LED with the tape then connect the magnet to the battery with some more tape. Then you just, well, uh, throw. The wide range of places that these could be put is endless; on cars, refrigerators, bridges, street lights, buildings, ect.