This joke tells that a tutor was always praising up his pupil in order to keep his job. In order to satisfy the father of his student, he as a tutor lied to the father. The father did not believe in what the tutor alleged so he called for a test. When the tutor gave the student “crab”, the boy just replied casually “umbrella”. The tutor praise him for cleverness instead of pointing out the mistake for being permanently engaged by his father. What’s more, the word “upright” is ironic to satirize the tutor having no professional ethics. This joke mirrors the tutor’s helpless and bitter life between the humorous lines. We can see that the tutor’s helplessness in the face of the miserable life.