lacrosse ball
The first ever weapon of mass-destruction. Used as a catalyst for winning lacrosse games, but when it's not tearing through the corners of a goal, can be a terribly destructive force that can break bones. Made out of pure rubber.
Little Tommy didn't know that when he threw his lacrosse ball, that it would fly out of his stick and smash a Ferrari, a window, then a lamp, next a television set, and then finally a man's femur.