Working on a farm at maybe 16? Don’t think I was even driving yet. It was Christmas season so that meant a lot of carrying trees around and sawing off the ends of stumps so that the trees would start absorbing water again. This stupid lady and her granddaughter were being kinda picky about their tree and wanted some of the knots cut off so I was doing so. Did I mention that it was raining? Because it was also raining that day. Being someone at least as stupid as the lady, I decided to cut *towards* my hand. The saw which could barely handle the tree had no problem skipping off the trunk right into my knuckle. So clutching the now sliced open knuckle with the now shredded rubber glove hanging off of it, I walked back to the break room, never talking to that lady again.
At the ER they tried shooting some novocaine in with a syringe. I will never forget the visual of it going in one side of the cut and shooting out the other side. I got a couple stitches and now have permanent reminder of which direction to hold my cutting instruments.