The story has been told of a mental hospital that many years ago devised an unusual test to determine when their patients were ready to go back into the world. They brought a candidate for release to a room where a water faucet was left on so that the sink overflowed and was pouring water all over the floor. Then they handed the patient a mop and told him to mop up the water. If the patient had enough sense to turn off the faucet before mopping up the water, he was ready to be released. But if, as in the case of many, the patient started mopping while the water was still flowing, they kept the patient for more treatment.