'When an illiterate boy moves to a new school, the school bully has him sign a contract, which he does because he doesn't want anyone to know about his disability. Unfortunately, the contract means he has to moon his principal, ruining his chances of having his painting hung in the art gallery. However, the boy calls him a coward because the bully wouldn't moon and so he ends up doing it, but unfortunately for the bully, he gets into trouble.' (https://en.wikipedia.org/wiki/Undone_(short_story_collection))