Had a very large one up in the high country above Yosemite NP invade a one-tent camp. Tore the place to shreds, while we watched. Banging pots and whatnot from 40ft away, it wasn't the least concerned with us. On another occasion, years earlier, had a big male (I think) tear into an early '70s "lead sled" vehicle. Tore a door right off the hinges, entered, emptied the big ice chest full of dogs and buns, and then skedaddled. All while we watched. Couldn't do a thing to shoo him away. Both knew they were in "safe spaces" in Yosemite, and that people somehow were constrained against going after them. It was open-season on campsites, though, from the bears' perspectives. Great place to grab lunch.Some of those black bears are pretty smart. In a Tahoe NF campground my daughter watched a sow check all 4 doors on a car without damaging it. The bear went over to one of the bear proof steel food lockers, calmly opened it, helped herself and closed the door. She told the ranger and his response was "so that is who is stealing food from the lockers." That sow was an expert thief. She never bothered anyone and found out if she just sat there and posed people would feed her. If someone tried to shoo her away she would go to another campsite. No fear of humans. She was pretty much considered a camp pet.