Serenade No. 13 for strings in G major, K. 525 (Eine kleine Nachtmusik)
composed by Wolfgang Amadeus Mozart

Seymour Skinner and Edna Krabappel strike up a conversation at a party and take a romantic interest in each other. They try to keep their affair a secret, but Bart sees them kiss. The following day the couple hears Bart telling his classmates about it and silences him by deleting his permanent records. Bart becomes their go-between for exchanging love notes, but he gets tired of that and exposes Skinner and Krapappel in the janitor's closet locked in a passionate embrace. The word spreads all over town and Superintendent Chalmers gives Skinner an ultimatum. Either end the relationship or face dismissal. Skinner admits that he is in fact a virgin and the matter is cleared up.

When a riot is begins at a Springfield contest that promises a luxurious trip to the most disgusting and dimwitted contest participant, Lisa, disgusted at the lack of intelligence, writes a letter that appears in the newspaper, Although no-one read it, Springfield's branch of Mensa International is impressed and invites Lisa to join the group. Along with Comic Book Guy, Dr. Hibbert, Principal Skinner, Professor Frink, and Lindsay Naegle, the group coerces Quimby to grant themselves power to the city. However, the power corrupts them, and they do an even worse job than Quimby did. Cornered by a mob, the group is saved when Stephen Hawking shows up. Meanwhile, Homer gets erotic photographs of himself for Marge, but fails to have sex with her.