Mine, also relates to the infamous X-acto knife...
I was cutting some sheet styrene to make a roof for a structure, using the x-acto, along with a metal ruler for a straight-edge...I usually turn the knife blade backwards to score styrene, but for some goofy reason, this time I was drawing it along the straight-edge with the cutting edge facing toward me...all of a sudden, the knife jumped over the ruler, & went right across my left index finger...well, the next thing I know, I'm recreating a scene from The Texas Chainsaw Massacre!

I make my way upstairs, & say in my most humble voice, "Honey, I think I need to go to the emergency room."
My wife grabs a dish towel from the kitchen, puts me in the car, & drives like a maniac to the hospital.
Well, now I'm sitting in the ER, feeling very brave, holding my hand, in the by now, completely blood soaked towel...(most impressive blood-letting in the waiting room at that moment!

)
I notice this kid, probably about 14 or so, sitting next to me, also with an injured hand...
"What'd you do?", I asked.
"Stabbed himself with an x-acto knife.", says his mom, who is sitting with him.
"Oh my God!", says my lovely wife, & the next thing I know she, & the kid's mom are comparing notes on what a couple of idiots we are.
While this is going on, me & the kid strike up a conversation about modeling...turns out he's into airplanes...we chat about plastic, & wood, the different paints we like etc...
Anyway, a couple of hours, & 5 stiches later, I was back home, finishing up that foof, & being MUCH more careful!
