An old man has a cat. The cat is very old, too. He runs very fast but his teeth are bad. One evening, the old cat sees a little mouse. He catches it, but he can't eat it, because his teeth are not strong any more. The mouse runs away. The old man is very angry. He beats his cat. He says, "You are a foolish cat. I don't like you." The cat is very sad. He says, "When I was young, I worked hard for you. Now you don't like me, because I'm too old to work. You should know you are old, too."