Black axle grease on the earpiece of cell phone(assuming the phone is black of course. Same black grease on the back side of the car door handle. Or my fav, replacing oil pan drain plug with a candle(this one is courtesy of magley;) )
^fail. There is nothing more fun than putting a shitload of baby powder or glitter down the defrost of a douchebags car and then turning the knob to high.