In the 18th century, a budding psychiatrist devised a foolproof way of distinguishing the sane person from the insane. The subject was locked in a room. On one side of the room were water taps; on the other side were mops and buckets. The test began when the taps were turned on. An individual diagnosed as mad would rush to the mops and buckets. The sane individual would stride over to the taps and turn them off.
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