Years ago ('81 or so) when I was in VF 151 we and our sister squadron, VF 161, were working out of Misawa, Japan practicing our bombing on a manned range north of the air base. We were carrying six, Mark 76, 25 pound practice bombs on two TER's (triple ejector racks) on each mission.
The mark 76 is shaped like a long teardrop with what amounts to a shotgun barrel from front to the tail. A spotting charge sort of like a shotgun shell along with a plug with a firing pin is inserted in the nose. When it impacts the ground it generates a plume of white smoke so the hits can be spotted by a spotter on the range or by other a/c in the flight.
A good buddy of mine in VF161 only got five spots out of six "hot" runs on the target which means that when the flight joined up after the last run he should have one "hung" bomb (i.e. it didn't come off the rack).
Well, as each wingman joins up they check the aircraft in front of them for hung ordnance. When the guy behind my bud joined up and said "you're clean", they knew they had a problem!
When they landed they wrote up the discrepancy for the maintenance log book, the bomb rack was impounded by the Safety Department, and the squadron filed a TFOA Report (Things Falling Off Aircraft). Then the investigation started.
One of the most important things to do was find out where the bomb went. That part was REAL EASY....it landed in...............................A SCHOOL YARD!!!
Fortunately all the kiddies were inside when it hit.
My bud ( name withheld to protect innocent ), was sweating bullets to say the least! When the rack was checked out they found that there was a short in the electrical wiring and that stray voltage had caused the bomb to come off whenever it felt like it and Murphy's Law being what it is it picked just about the worst possible place to land.