In Yosemite one night making a bathroom trip I did not bother with a flashlight, we were only 50 yards or so away. On the way back to the camper "something" shuffled past me going the other way. Litteraly a couple feet away. I thought nothing of it, but about 30 secods later realize it was MUCH to big to have been a racoon!! Later on another bathroom trip I too ke the flashlight, and walking back shined it on a bear sniffing the door of the camper! I yelled at it, it didn't care, just sniffed and then walked away.
Once when I was a kid we had a bear come through the campsite, we quickly all jumped into the VW camper bus with the dog who was barking furiously. We forgot the back was open. Dog jumped out and 16 lbs of barking fury chased the bear away, mom then had to go after the dog, the bear decided we were not worth it.