South Park: Season 4, Episode 3 - ProjectFreeTV

4 - 3: Timmy! 2000

Mr. Garrison's class gets a new student named Timmy. Not realizing Timmy is handicapped, Mr. Mackey suspects he has ADD and excuses him from school work. When the other kids see this, they claim to have ADD too. Soon, every kid in South Park is on Ritalin. Timmy becomes the lead singer of local band, "Lords of the Underworld," which offends singer Phil Collins.