The Simpsons (1989): Season 18, Episode 14

18 - 14: Yokel Chords

When the ever-righteous Lisa protests denying education to Cletus' 'hillbilly' kids, Principal Skinner offers her a chance to tutor the kids herself. However, Lisa's plans to help are diverted when Krusty spots the kids during their field trip and decides to use them as a musical act for his show. Meanwhile, in a scheme to steal his lunch for the day, Bart tries to scare his peers out of the cafeteria by claiming it's haunted by the ghost of an old school chef who uses students as ingredients in his recipes. When the school erupts with fear and chaos, Bart is punished and sent to receive psychiatric treatment, and he develops a unique relationship with his therapist.