I shot an old bowling ball once at about 10 yards with a .38 Special. The bullet (158-grain round-nosed lead) ricocheted almost straight back and I heard it buzz just over my head. OK, lesson learned, no more of that.
I was shooting my single shot .22 cal. pellet gun from about 5 yards. The target was square on to me, and the pellet ricocheted straight back and hit me in the crotch. Good thing it wasn’t anything more powerful. Even THAT caused my knees to get a little rubbery for a minute.