"When Friends Get Mad" is a final episode of Little Bill.
Little Bill and his friends are painting pictures of Things We Like About Spring to decorate the room's bulletin board. Little Bill is very proud of his painting of a spring day, with flowers and trees in a park, but when Kiku tries to look closer, she accidentally knocks over the water used to rinse the brushes that spills on Little Bill's paper, ruining it. Close to tears over his wrecked hard work, Little Bill gasps, "Look what you did!" Kiku tries to apologize, but he just gets madder, and responds by crumpling up her paper. Kiku begins to cry and says, "Little Bill, I said I was sorry!" Little Bill doesn't understand why everyone "sides with her," and expects him to apologize! He won't feel sorry at all because Kiku started it. Miss Murray puts Little Bill in timeout, explaining that while she knows he is angry, he shouldn't have messed up Kiku's painting (even though she messed up his, which is not the same thing). When she explains the difference between how they wrecked each other's paintings, he thinks everyone is on Kiku's side. Miss Murray says that they are not taking sides, but what he did was wrong and that he should apologize to her. He refuses and just wants to go home, which everyone will be doing soon. Miss Murray leaves him in the time-out chair while she cleans up the rest of the paint, but he doesn't care because he still isn't sorry. When he gets home, Alice the Great has learned about his hard day (but not how it happened), and Little Bill tells her and Bobby about it (as she gives the boys a bowl of grapes to share), and Alice says that while she'd also be pretty upset if anything she liked very much, she is certain that Kiku didn't mean to wreck Little Bill's painting. Bobby offers to tell him a joke, but it doesn't make him laugh; however, he tells him to ask him if he needs another joke. That night, he states to his parents that he doesn't want to go back to school. After guesses from Big Bill, all of which are answered, "no," he explains (when Brenda asks him what's wrong) what happened, and they talk to each other, prompting him to admit that what Kiku did was an accident, but what he did was on purpose because he was mad and it made him realize how bad he wanted kiku to feel the same way about her picture as he did about his . The next day at school, Little Bill apologizes to Kiku for how he treated her and offers to help make a new painting with her.