Grade School Confidential

"Grade School Confidential" is the nineteenth episode of The Simpsons' eighth season. It originally aired on the Fox network in the United States on April 6, 1997. It was written by Rachel Pulido and directed by Susie Dietter. The episode establishes the long-term relationship between Seymour Skinner and Edna Krabappel.Bart witnesses a romantic moment between Principal Skinner and Mrs. Krabappel and acts as a snitch for them. However, they later embarrass him and he exposes their romance to the public.

Martin Prince invites his classmates to his birthday party, but the event turns out to be incredibly boring, and to cap it off, things come to an abrupt end when everyone becomes ill with food poisoning, because Martin's mother, named Martha Prince, was serving diseased oysters instead of cake. In the meantime, Principal Seymour Skinner and Edna Krabappel attend and have a conversation which leads to them discovering that they have romantic feelings for each other. They end up kissing in Martin's pink playhouse in an act witnessed by Bart Simpson, who did not get food poisoning since he fed his oysters to Martin's cat, along with Lisa who feigns sickness so she could leave without excuse.

Bart plans to reveal what he witnessed, but Seymour and Edna fear that they would be fired if anyone found out and they swear him to secrecy. They hire him as their gofer so they can secretly exchange messages. Bart agrees for a while because the reward for his cooperation is that Milhouse will inherit Bart's poor school record. Eventually, Bart grows frustrated about his home, school and social life continually being interrupted to help them advance their relationship, putting him in embarrassing situations. One afternoon at school, after he is embarrassed in front of his classmates by having to say one of Seymour's messages to Edna out loud, Bart bitterly gathers the entire school in front of a janitor's closet and he opens the door to reveal that Seymour and Edna are making out.