Code Of The Schoolyard - The Simpsons

From (Season 1 Episode 5) “Bart the General“ Bart runs afoul of Nelson Muntz, the school bully, who begins attacking Bart every day after school. Homer suggests fighting back, which does not work. Desperate for a solution, Bart visits Grampa for advice. Grampa takes Bart to meet Herman, who suggests that Bart rally all of the school children and declare war on Nelson. Bart and his army attack Nelson and successfully manage to convince him to give up his bullying ways.