I'm surprised bears don't kill more people than they do: when we were in the Rockies for a week a few years ago (actually, lots of years ago, yikes!) I saw at least three instances of people doing things so stupid that I'm surprised they survived - like approaching the bear cub by the side of the road so they could take pictures of their kid with it  (where's Mommy Bear???) or chasing a black bear around with a video camera at short range. At least I had a 500mm and was pretty far away.