Grizzly Man is about Timothy Treadwell, who lived with grizzly bears up in Alaska for 13 summers until one of the bears decided to eat him and his girlfriend, Amy, in the summer of 2003. The documentary was put together by Austrian film maker Werner Herzog using footage Treadwell shot during the last 5 years of his adventures among the grizz.
If you like nature & animal shows, this movie has some astounding footage of wild, ferocious bears & shy foxes interacting with Treadwell. If you like biographies, this movie is also a fascinating character study.
The night Treadwell and his girlfriend were killed by a hungry bear, his video camcorder was running, but the lens cap was left on. So there's actually an audio tape of the attack. Out respect for Treadwell's friends, the film doesn't allow the movie audience to hear this tape, but you get to watch the director (Herzog) listen to it and react very emotionally. Also, the coroner who examined the evidence from the bear attack describes what's on the tape in relation to what was left of the bodies.
This might sound like a gorey and depressing film, but it isn't. A major theme is the need to respect boundaries, which is something that resonates with me. Comments by a Native American ecologist are particularly interesting in this regard.
You could say Treadwell had a "fatal obsession" that caused him to live with extreme passion and commitment. I had to wonder about the girlfriend, who undoubtedly did not sign up for a bear attack when she followed Treadwell into the wilderness in 2003. He appears to have been a very charming, even charismatic person, although in some of the movie footage he appears to be deranged.
BTW, Treadwell founded an environmentalist group called Gizzly People. See http://www.grizzlypeople.com/