A cook once roasted a duck for his master. The roast looked so delicious that the cook could not resist his temptation. He ate up one of the legs of the duck. When his master sat down to eat, he quickly noticed the missing leg . He asked of the other leg. The cook told him that the duck had one leg only . The master was a clever man. He said that it could not be possible. But the cook insisted that this duck had only one leg. The master was annoyed with the cook and threatened to fire him from his job.