Fan-Demonium are a cheerleader group who performs at the Springfield Speedway.
Fan-Demonium out on a show where they fired T-shirt cannons into the crowd. They fired a T-shirt to Dr. Hibbert, who failed to find the shirt funny. As they were wrapping up their show, telling the audience that nobody else wanted a T-shirt, Homer jumped up and down, wanting a shirt. He drew a target on his belly in ketchup for them to hit. As Fan-Demonium fired, Homer ducked down to grab a bobby pin from the floor and the T-shirts hit Maude Flanders, knocking her over the bleachers to her death.
Fan-Demonium then attended Maude's funeral as part of a generous settlement where they fired a 21 T-shirt cannon salute.