When I was in my teens and spending the night at my oldest sisters house, my bedroom was on the second floor of the house right across from the bathroom with the stairway separating them. Well, late that evening I woke up and needed to use the bathroom. So instead of doing the smart thing and turning on a light, I made my way to the bathroom in the dark. When I turned into what I presumed was the bathroom doorway, it turned out to be the stair way and I fell down a flight of oak steps on my bum. Needless to say, my bum and tail bone were painfully sore for a couple of weeks.