I'm kind of like Wapitirod and have had only one self defense situation and that was with a badger and I ended up ended that attack with the 12ga I had on me, which I was lucky to get to after picking of my caller. But when I hear people talk about bear attacks this one comes to mind.
http://www.nytimes.com/1987/06/26/us/grizzly-bear-killed-after-biting-warden-in-montana-forest.html