My personal worst was my stupidity using the ultra thin razor sharp <a href="http://www.sonic.net/~quine/sbm_rcm.html">Ross Aki SBM</a> machete to cut some very high grass in places I can't reach with a mower. I hate noisey weed wackers, so I just grab the beautiful SBM and trim away. In this case, I had grabbed a big tuft of grass in my left hand, and while holding it, swung under my hand with the machete. I don't usually swing so close to my hand, but big mistake this time. Off came a nice slice of skin and tissue about 1/2" long 1/4" wide, and maybe 1/32" deep from my index finger! Bled profusely for a while, even through a couple of pressure bandages. Healed very slowly. Nice scar now, very prominant, but I don't talk about it much. My whip scars are much more romantic!