South Park Episode 603 - "Freak Strike"
The kids learn that Talk Shows offer special assistance to grossly disfigured people who appear on their show.
They immediatly sign Butters up as a guest with a a strange deformity. With the help of some strategic physical enhancement, Butters is sure to beat out all the other freaks and win a prize. However, when there isn't enough of Butters' prize to go around Cartman makes a bid for his own guest spot with Maury when he talks him mom into joining him on the segment entitled, "Please Help My Out of Control Child"