"One doctor said that if he was going into surgery to have an arm removed, he would use indelible marker to write on the other arm, "Do not remove this arm.".

I had shoulder surgery on my left shoulder a few years ago. Everytime I saw the Dr he would check my right shoulder and I would have to correct him. When it came time for surgery I said IM writing on it wrong shoulder. He said people do that all the time. Barry