Good deeds and other laughing matters

Disturbed by her student's rude behavior Shelby's fourth grade teacher decides to give out a "Good Person Award," and Shelby and her nemesis Brooke are instantly in a competition with each other; the trouble is that most of their ideas about being a good person do not actually involve helping or being polite to other people--but in the end Shelby finds that what she does best is to make people laugh.