The patient was recovering after an operation. His friend came to visit him and asked how he was getting along.
"Well," the patient began, "after my first operation they had to cut me open again. The doctor had to take out the sponge left in me."
"But you got over it all right?"
"Oh, yes. Only I had another operation yesterday. They found that they had operated on the wrong part."
"Thank God. You're all right now, though," the friend said encouragingly.
At that time the doctor came in saying, "Has anyone seen my hat around here? I left it somewhere yesterday."