Josh gets the opportunity to act as a student teacher for his little sister Megan's class. Everybody hates both him and his utterly boring teaching methods. His awful teaching and the piles of homework and hard tests he dishes out cause Megan's friends and classmates to turn on her, leaving her out of play-dates and birthday parties. Desperate for revenge, Megan uses her cleverness to publicly embarrass Josh and get him instantly fired during a science lesson.
—fallgeek