Oh - working with bears... I saw a news item maybe a year ago. There was... I'm remembering a private zoo, I think... they had a grizzly they'd let you pose with and take pictures. The video showed the bear standing up on his hind legs, and the guest standing right next to it for a nice two-shot portrait. In the middle of this, the bear very casually looks at the guy, then very casually leans over and rips his throat out.
I seem to recall the keeper using a combination of pepper spray and frantic beating with a club to get the bear off the guy.