When I was 10 or so (old enough to know better, but still too young and stupid to take heed), I was having a hard time prying the lid off of one of those little plastic "bubble" containers you get from quarter toy machines. So, I decided to use the blade on my Vic Classic to drill a hole through the lid. I figured as long as I was careful, it would work out OK. Well, inevitably the blade folded on my finger, which bled like crazy and freaked me out. Took a while to get it to stop, but I didn't need stitches and it didn't even leave a scar. That was a relatively cheap lesson in NOT using the blade of a knife like an awl.
One time a coworker asked to borrow my knife. I lent him my Gerber folder, which I use to cut open boxes. He came back about 15 minutes later with a good bit of the black finish worn off the blade, and a couple of dings in the edge. Turns out a customer had locked herself out of her car and he was somehow (I'm not sure exactly how) trying to get either the window or the door of the car open with the knife. I was pretty pissed, but it could have been worse. I managed to grind the dings out of the blade, and just considered the missing blade blackening to be extra "character" -- after all, it's a working knife anyway and wasn't in mint condition to begin with.