There really isn't a bear, looking to kill and eat you, behind every tree in Alaska.
I have had numerous, probably dozens of close range bear encounters but the one kind of encounter I haven't had and hope to not have is a charge at close quarters from a bear I bumped into unsuspected.
This scenario is far down on the list of what we are guarding against by carrying a firearm or spray, although some inexperienced bear people might not realize that is the case.
BTW, of my three stickiest bear encounters, two were with black bears, one with a brown.