I was 17 and stupid. I was laying on my bed, flipping a gerber Mark II. I threw it up a bit too hard, and it over-rotated and rather than letting it cut my fingers, I just let it land on me...in my chest. I pulled it out, and as blood ran through my fingers, i went down the hall to the bathroom. Keeping pressure on it, I ripped off a bunch of toilet paper, folded it into a thick square and slapped it onto my chest, and put pressure back on. I then went back to my room - grabbed some military grade duct tape (the 100 mile an hour stuff, I worked at a surplus store at the time), tore off a piece with my teeth, and slapped it over the makeshift gauze pad. I left it on there for like a solid month, checking it occasionally. I've got an interesting scar now to the left of my heart.
lesson learned...don't be a moron.