the last time I ever got "bit" by anything was when I was 4 or so and my dad was teaching me to shoot a breakaction .410.
Unfortunately he let me figure out the hard way why not shouldering the firearm as opposed to stuffing the stock under my armpit was a bad idea.
Course, what you might think would happen didn't, it was quite a bit more brutal.
I choked up REALLY tight on it after pulling back the hammer (ya'll see where this is going yet?) and BAM right nostril tenderized by hammer. Kinda a freak thing, never heard of anyone else doing that.. seen tons of friends get scoped before. One had it real bad, perfect moon around his eyebrow but blood everywhere. That was with a .308.