That's So Raven Season 4 Episode 10

Sister Act

Raven and Sydney enter a beauty pageant to raise money for the Community Center. Things get personal when Muffy and her younger sister, Buffy, also enter the pageant. This causes Raven and Muffy to become too competitive, leading to everyone in the room quarreling -- even Chelsea, Eddie, Stanley, Cory, Victor, and the audience. When Raven has a vision of Sydney releasing the rope that holds a giant globe that will fall on Buffy during the fight, she stops everyone from fighting. However, all 4 of the girls are immediately "disqualified for starting a fight".