Buster Baxter, Cat Saver & Play it Again, D.W.

Buster Baxter, Cat Saver: Buster gets a cat down from a tree with his ice cream and his mother publishes a story on it. When people start calling him a hero, this goes to his head and he starts acting important (i.e. cutting everyone in line for a new movie, and getting away with it) and retells the story with embellished details. Arthur, Francine, and the Brain make a fool out of Buster to humble him, but he ends up saving Arthur and Francine from a runaway piano.
Play it Again, D.W.: D.W. is still playing her "Crazy Bus" CD (since "Buster Baxter, Cat Saver") and Arthur is already annoyed by it. One night the CD goes missing. D.W. thinks Arthur took it, but her parents took it by mistake.