The writers have made Homer's intelligence appear to decline over the years; they explain this was not done intentionally, but it was necessary to top previous jokes. For example, in "When You Dish Upon a Star", (season 10, 1998) the writers included a scene where Homer admits that he cannot read. The writers debated including this plot twist because it would contradict previous scenes in which Homer does read, but eventually they decided to keep the joke because they found it humorous. The writers often debate how far to go in portraying Homer's stupidity; one suggested rule is that "he can never forget his own name".