Who: A 70-something woman
Where: Samuel P. Taylor State Park, San Francisco, California
Her mistake: Bad luck
What happened: A woman was hiking with some friends in a local state park when a branch with a diameter of 6 to 8 inches fell on her head. The woman suffered severe injuries and knocked unconscious. The injuries were so bad that she required a chopper rescue to a local hospital. There is no word on her current condition.
Read the story here.
Unfortunately, she never regained consciousness and was taken off life support last Sunday. There's nothing you can do to avoid this kind of thing – it fell 20 or so feet so was way above her head. You just have to live your life doing the things you want to do, as she did.