I once had a bear with two cubs climb down out of a tree and start galloping right towards me and a friend. She didn't know we were there until she got to about 20 yards away and we started making noise and yelling. She stopped, stood up and I thought o boy this is it. She got back down on all fours, turned and went quickly in the opposite direction. Good thing we alerted her before she passed us with her cubs on the other side of us. This was about 15 years ago while geocaching at the Wesley Hill nature preserve near Cummings nature center.