The boys visit Celebrity Mall to look for things to buy with their birthday money. Alvin buys a skateboard and knocks into an elderly woman taking her for a wild ride. She enjoys the thrill, but Simon and Theodore insist on buying her lunch to make up for the incident. Alvin assumes that she is wealthy from a story on the news so he goes back to the mall in search of her, convinced she is looking to give him an award. He is mistaken for the shopping mall mugger by an undercover cop and arrested. Out of jail, Alvin heads to the mail once again only to interrupt the making of a Cleano commercial. That night be misinterprets his brothers' advice and decides to throw a party for senior citizens. The woman Alvin hit invites Dave, Simon, and Theodore to dinner while Alvin, despite his lack of preparation, learns old people can be great fun.