A "friend??" handed me a double barrelled 10 ga. shotgun with 3.5" magnums chambered. Target was a 55 gal steel drum about 15 yds away.
First round, fine, caved in the side of the drum. Second round, not so good, as I accidentally touched the second trigger during the recoil from the first round, so the gun essentially doubled, and not being ready for the second round, the gun stock wacked my jaw something awful. That and shooting an overloaded Hawken .58 cal rifle with a skinny brass butt plate, from another "friend??" were the only guns that ever hurt me.
Never shot either one again.