 After Homer realizes that he is " slow " , Marge recommends that he take an adult education course at the annex center . Down at the center , however , Homer changes his mind and decides to become a teacher . He talks to the administrator and accepts an opening to teach a class on having a successful marriage . Despite being confident that he can pull it off , he is frightened on his first day and is unable to help his pupils with their relationship problems . The class collectively gets up to leave , but when Homer mentions his conversation with Marge in bed , the class decides to stay , eager to hear gossip . Marge soon discovers that everyone in town knows her personal secrets , reacting by confronting Homer about it and he promises to stop . He instead continues telling her secrets anyway . Homer then takes the night off teaching class by having his class observe the family over dinner . 
