Dumbest thing was MEEEEE >_< demonstrating how I could flip open the knife (gerber folder) just by flicking your wrist the right way and the knife slips out of my hands and buries its point in my leg
I did almost the same thing; I used to live in a very rough area* and there was a noise at the door like someone was trying to get in, so I grab an 8inch fixed blade and figure, right, I'll put it in my pocket and answer the door; if it turns nasty I'm prepared.
I still have a crescent shaped scar on my leg where the tip went straight through my jeans. God I'm a muppet.

*(like, someone was murdered at our local shop on the day we came to look around the flat for the first time)
EDIT: I can't remember what the noise actually was; whatever it was it was perfectly innocent.
And no, I've no idea why I didn't sheath it first :jerkit: