Sometime around the late 1960s or early 1970s, I was in the village near where I lived and found that the territorial army (or some similar military / cadets force) had an exhibition on.
On part was a squad repeatedly "firing" a mortar; alternately dropping a dummy round in, then tipping it out and dropping a flashbang in instead, to simulate firing.
As I was walking back past that part, they managed to get the sequence messed up - flashbang AND dummy round.
The sound when it went off was rather different to the flashbang in an empty tube!
The people supervising seemed to get rather agitated at that point and the mortar demo stopped.
According to a local newspaper, the dummy shell was found sometime later in a garden at the other side of the village... Luckily no one was in the way at either end of its path!
On part was a squad repeatedly "firing" a mortar; alternately dropping a dummy round in, then tipping it out and dropping a flashbang in instead, to simulate firing.
As I was walking back past that part, they managed to get the sequence messed up - flashbang AND dummy round.
The sound when it went off was rather different to the flashbang in an empty tube!
The people supervising seemed to get rather agitated at that point and the mortar demo stopped.
According to a local newspaper, the dummy shell was found sometime later in a garden at the other side of the village... Luckily no one was in the way at either end of its path!