I was 15 or so, trying to drill a hole through the bottom of a 5.56 casing to weave onto some paracord for a necklace. Using whatever I found in the shed to try and accomplish this, I held the casing in place with a pair of vice grips as used a shitty old bit in a hand drill to try and put the hole in it. Well, instead the bit snapped, and I put what remained of the bit in the drill through my finger. Being a stubborn idiot, I dumped some hydrogen peroxide on it, applied pressure with a paper towel, then covered my whole finger in duct tape. Fortunately didn’t get infected (the bit was probably screaming hot), but I’ve got a fun scar now!