Answer: A cook once roasted a duck for his master. The roast looked so delicious that the cook could not resist the temptation and ate up one of the drumsticks. When his master sat down to eat the meal, he quickly noticed the missing leg. He asked the cook what had happened to the other leg. The cook told him that the duck had one leg only. The master said that there was no such thing as a one-legged duck, but the cook insisted that particular duck had only one leg.