I have a distant relative. She and her husband had a cabin cleaning service. Well, she was in one cleaning it up after a vacancy and opened a door which she did not know was at the top of a stair case. She must have just opened and walked in while reaching for the light switch. Anyhoo, she fell down the stairs and was in a coma for months, now she can only move her arms a little, she can't walk or really speak much.