Pacing back and forth, a man was getting really anxious about his imminent operation.
His wife asked him: "What's the matter? Why are you getting so worked up?"
He replied: "I heard one of the nurses say 'It's a very simple operation, don't worry, I'm sure you'll be all right.'"
"She was just trying to comfort you," said his wife. "What's so frightening about that?"
"She was talking to the surgeon!"