Joey broke his arm just above the elbow. 

When he went in to have it fixed, they said they would have to put him under. 

He woke up with the doctor looking at him with a very concerned and somewhat guilty look on his face. 

"It seems I have operated on the wrong part," he said. 

Joey looked down and his knee was all bandaged up. 

All he could mutter was, "This is not humerus."