Lessee... Where to begin...
At 17 I got my right thumbnail cracked in half and torn all to $#!& speed-loading an Auto-5.
At 18 I learned the importance of heat-shielded AK foregrips, Romanian WASR-10, not mine.
At 19 I tore my hand open for the umpteenth time shooting my Kahr/AO 1911A1 GI, but this time I didn't stop (Too cold to feel it.) and put another 500 or so rounds through the .45 as well as about 250 through an Israeli Jericho 9mm while my range buddies looked on in horror. (Both weapons were drenched in blood by the end, as was my hand.)
At 20 I caught hot .45 brass right in the ol' rods and cones. I swear I have "WIN 45 AUTO" engraved in my retina now.
Uhh, caught a 180-degree .22 ricochet right in the liver once while shooting into a dirt berm across a creek with a pizza box resting on it. The slug completely reversed direction somehow. Just tapped me, really, felt like a twig hit me.
Then of course there was the time I was shooting a 7mm Win Mag out of a Weatherby with no recoil pad. Ow. My whole shoulder was purple for a week!
My favorite, though, has to be the one time I thought I was pulling a gun in self-defense, but was in fact pulling it on a noisy tomcat. I only noticed after my friend pointed out the blood on my shirt, but I was so hasty on the draw that I had torn open my side with my fingernails while drawing from an IWB rig. (Owch!)
And finally. the injury caused by a safety procedure... Kind of a bad idea to trip the slide release while feeling around inside the chamber of a 1911 with your pinky. Don't ask me how I did it, my thumb wasn't anywhere near the lever.