A few years back I made a mistake that ended up costing me....well a pic is worth a thousand words:
I'm a cabinet maker and was doing a dropcut on a tabel saw (a pretty dangerous type of cut) w/ a 1/4" dado blade and caught a kickback (the piece gets thrown back at you by the blade) while I was still pushing, I ended up ramming my middle finger directly into the blade running it into my middle knuckle, thus requiring a surgical amputation.