One time I went for therapy on my arm and neck. The therapist was stretching my arm and neck. I was laying on my belly. He also did an ultrasound on my arm. He left the room for a few minutes and I turned on my back. He came back in and did some more stretches on my arm and neck. He asked me how did that feel. I said, "it feels great but it’s the wrong  arm." lol What a laugh we had. Next week I went back for therapy again and when he came in the room, I had written on my arm in pen "This is the right one."