Ouch! I've done the stapling thing too, but not deep or anything. I somehow stapled my index finger and pinky together. The reason this sucks is because my pinky is unusable so it just sticks out, ouch.
I have had some fairly serious injuries in my life so far. I ripped the ligaments in my knee when I was about 16/17, although there was zero visual damage it was the second most pain I have been in in my life. The first being bad sunburn in mexico about 3 years ago, I didn't sleep for 2 whole days! lol. About 12 weeks ago I had a bad fall at football training and I dislocated my shoulder, broke my collar bone and my very top rib. Again, no blood and guts but I now have a 'budgie on my shoulder' (Thats the more informal way of saying my collar bone will be forever popping out of the top near my shoulder). I think the worst I have seen in real life was at 5-a-side football. My mate Dean was running for the ball and he went over on his ankle, which we all saw in real time (it looked awful) but as he fell he landed on the wall. We all rushed over to look at his ankle which was ousing blood and his bone sticking out of his sock (seriously gross). Then someone noticed his arm!!! He must have smashed it off the wall on his fall, it was snapped cleanly and flopping over like jelly (no blood at all). I was nearly sick!