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One day a doctor of the insane asylum was examining the progress of the three insane people. If he can pass the exam, he will be released, and if he does not, he will be detained for two years. The doctor told the three to jump in front of a waterless swimming pool. The first madman immediately jumped up and broke his leg. The second lunatic also broke his arm by jumping according to the doctor's words. But the third lunatic did not agree to jump into the corner. The doctor shouted for joy and said, "Hey, you're fine." I will release you today. Well tell me why you did not jump? friend he said, i don't know how to swim '.