Boom!
It's really hard to get a bomb to go off by just dropping it.
One day I was eating lunch as they were loading skids (little wagons) of 500 pound bombs. They bring them up from the magazines below and transit the ship's mess decks with them.
There must have been a twenty or more skids with three bombs a piece strung though the deck. So I'm sitting there enjoying fine Navy chow when the skid directly across the table from me rolls forward as the ship rocks and the middle 500 pound high explosive bomb hits a stantions (vertical beam) and the stantion rings loudly. The ship rocks the other way and the skid backs off about 12 inches.
The ship rocks again and the bomb slams into the steel beam again. About this time I look around and theres 50 sailors watching this thing go back and forth now. The thing slams into the pole for a third and forth time and before I decide to not tempt faith for a fifth time and struggle to slow the load down. I found an ordanceman and had him lock the brake of the skid again.
They thanked me because the bomb could have had the treads damaged so that they couldn't fuse the thing later on. Nobody else was concerned enough to stop eating to even bother to stop the bombs from slamming into the beam.