Your picture reminds me of an incident a few years ago on Cape Cod near Otis Air Force Base. They were doing some target practice on the base when one of the shells overshot its mark and landed in the middle of the main highway on Cape Cod. It exploded right in front of the car being driven by a WWII vet. For a minute the poor guy thought he was back in the war. It left a huge crater. I know it wasn't funny but the write-up in the paper was hilarious.
I never even heard about that Cape Cod incident. I have friends who are in the National Guard...and this type of "accident" like you described...seems to happen more than we would guess.