"A well-known joke - a fool who thought he was a grain of corn. After some time in a mental hospital he was cured; now he knew that he was not a grain, but a man. So they let him out; but soon after he came running back saying, 'I met a hen and I was afraid she would try to eat me.' The doctors tried to calm him down. 'What are you afraid of? You know you are not a grain, but a man.' The fool answered: 'Yes of course I know that, but does the hen know?'"