A patient on the operating table is coming round after an operation. Suddenly he jumps up and strikes the surgeon as hard as he can. Why does he do this?
HINTS:
Q: Did the patient have some grievance against the surgeon? A: No.
Q: Was the surgeon a genuine surgeon who had carried out a proper surgical operation on the patient? A: Yes.
Q: Does the nature of the operation matter? A: No.
Q: Does the profession of the patient matter? A: Yes.

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THE SOLUTION

The patient is a boxer. The last thing he heard was the anesthetist counting 1, 2, 3, 4, and as he comes round he automatically tries to beat the count and resume the fight against his opponent.