Reminds me of an 'incident' when I was 5 or 6 years old.
A couple of other kids and I got our hands on some .22 (rimfire) ammo, and proceeded to experiment a tad.
We wanted to see if we could make one go off by setting one on a stone and throwing a brick at it (straight down, doncha know, for accuracty purposes.)
The experiment was a re-sounding success !!!
Had a dickens of a time 'splainin to Mom how I got a couple of shrapnel wounds.