I was recovering some used indoor range lead and was working outside with a turkey cooker and a c-i dutch oven. There was about 150# and it was pretty dirty.
Somebody, at some point, must have had an "alibi" with the .22 and threw the misfire downrange (and into the bullet catcher). As the mix was melting, the round went off. I'm lucky it was winter and that I was dressed for the cold in addition to my full face shield. No harm to me, but there was some patio furniture that has some splash pattern on it.