Funny story. One of my high school teacher's wife was in the army in a demo team. Her team was to blow up a bridge and the officer in charge made a slight misscalcualtion on the amount of c4 he needed for it. In stead of ten pounds of c4 it was one hundred pounds of it. He said they relized the mistake when it started raining car sized peices of bridge over a mile a way some peices up to three.