I was fishing a river in AK one time, watching brown bears on the other side doing the same. A while later on our walk down a trail back to our car we had two brown cubs run full speed right past us, both of them brushing up against us as they ran. This was a very narrow trail through a forest with trees all around. We jumped off the trail behind trees as we waited for mama to run by. She never did and we never saw her. It was a LONG 5 minute walk to the car. Pretty crazy.