Anecdote from several years back --Ketchup? I don't see any Ketchup.
Reminds me of an incident on my last sea tour onboard the USS Jason (AR 8) in the early 90's. We were practicing throwing MK3 concussion grenades, designed for anti-swimmer/diver use, off the fantail. One young sailor only managed to get it a couple feet over the safety rail. It exploded very close to the hull and the shock actually jarred loose a firemain pipe connection, causing some minor flooding in one of the engineering spaces. The CO was not amused!