My senior year in high school our yearbook was going to have two quarters embedded in the cover. The books came back from the printer with no quarters, just quarter-sized perforations which the staff had to carve out with X-acto knives. I wasn't on the yearbook staff, but I was on the newspaper staff which met in the same room so when I went down there before class one day I see the yearbook editor in chief and a couple others carving up yearbook covers. I stood around to BS with them for a bit until they guilt-trip me into helping them out.
I grab a stack and sit down. No problems for a while but when I get to the last book in my pile, one of the perforations just won't pop out of there. I grab the knife and try to use it like a lever while steadying the book with my left hand. The perforation gives way alright, and the knife zooms right into the base of my left thumb.
I stand up and start shaking my arm because of the sting of stabbing myself and look over at a friend of mine with an expression of "can't believe I just did that idiotic thing" but I notice that he is pale as a ghost, so I look down and see my entire lower arm drenched in blood.
Now, everyone in the class is freaking out. This was before digital photos so we had a darkroom and just outside the darkroom was a sink around which all the photogs gathered. I head over to the sink to run some water over my hand and photogs scatter everywhere as I approach.
I run some water in the sink, but I hear all the commotion of people freaking out, so I turn around and take a few steps back toward the middle of the room trying to calm everyone down. Unfortunately, my way of trying to calm them down was putting both my hands up in that "stop" gesture which only sent blood flying all over, thus making the collective freakout far worse.
Eventually, my editor-in-chief Mel grabs a stack of brown paper towels, shoves them into my hand and grabs my arm to drag me down the hall to the office. On the way, Mel pulls aside the towels and we see just how bad this whole thing is. Pretty bad. Needing stitches bad.
At the office, I explain that I cut myself with a knife. Now, it is absolutely my tendency to downplay every bad thing that has happened to me ever. I could have one of my limbs dangling by a thread and I would claim I was fine and it was really nothing because I never want people to worry about me. Still, this was pretty bad, so i fugred they'd call an ambulance, but I evidently downplayed it enough that without looking up, they tell me to have a seat and they call my mom who comes to get me and take me to the emergency room.
When I get there, I explain to the woman at the desk "I cut my hand with a small knife" and she, with an expression of total boredom, directed me to a seat in the waiting room. I sit down and the only other patient there is a man in his mid-30's, scruffy face, flannel shirt, work boots, nail sticking out of one of the boots and clearly lodged in the guy's foot.
"So, what are you in for," I ask him.
He explains his construction accident and I explain my yearbook accident and the receptionist overhears me and realizes "cut myself with a small knife" may have downplayed the situation slightly. She immediately rushes over and with a panicked look on her face she rushes me into an exam room and says a doctor will be with me shortly.
A nurse comes in first and takes a look at my hand and immediately gasps and looks like she's about to be sick. Another nurse comes in and has basically the same reaction. Finally a doctor comes in and tells me I came one millimeter away from slicing the tendon, may have done some nerve damage and was lucky I wasn't headed for surgery to repair it. Came away with eight stitches and the inability to use my thumb for the most part. It was three years before I could so much as tell hot and cold with it.
The next year when I was in college, I get a call from one of the people still on staff to tell me that I had become the centerpiece of the teacher's cautionary tale on safety with X-acto knives.