Sometimes people need a material reminder that grizzly bears, though they look cumbersome and slow-moving, are actually very fast. Faster than you are.
Just look at this footage shot in Yellowstone. This woman, apparently thinking she's safe just because in a parking lot, stands filming several grizzly bears from a distance that, well, a bear could cover in an instant.
Then, one of the grizzlies bluff charges the woman at a gentle lope - barely jogging, in grizzly terms, but the woman gets the picture (albeit a bit late). She finally turns and walks away from the half-wall in front of her, realizing that it stands about the same chance of stopping a charging grizzly as a Triscuit would have stopping us.
Thank God the bear wasn't interested in tearing her to bits.
"Oh my God. Oh my God," the woman says as it dawns on her she's in real danger.
"I got that on video," replies the person filming.
"Me too," says her companion.
The only other party involved are the bears, and as far as we can tell, none of them were filming.