Replying to World's best car prank

Have an enemy or someone who has a car you would like to screw with. Try this.....
First buy a few cans of foaming shaving cream and liquid nitrogen or dry ice. Put the shaving cream cans in the liquid nitrogen until they are completely frozen. After a while take a sharp box cutter or something and rip open the metal and you will be left with a solid cylidner of shaving cream. Keep it in the cold stuff. They, throw a few of these frozen shaving cream chunks into someones car on a hot day. When they thaw, they will expand and fill the car totally up with shaving cream.