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#64 Grade School Confidential
Season 8, Episode 19 (Guide from the Simpsons Archive)

At Martin’s birthday party, while everyone else is getting sick from the oysters, Bart catches Skinner and Krabappel starting a love affair in the playhouse. The next school day, when they discover that Bart caught them, they make a deal with him that gets him to keep their romance secret. However, they end up pushing Bart too far as the courier of their love messages, and he leads the majority of the school to find them making out in the janitor’s closet. Kids being what they are, the parents get the idea that Skinner and Krabappel were having sex in the closet. After Chalmers fires them for refusing to break off their relationship, with Bart’s prodding, they barricade themselves into the school and refuse to come out until they’re offered a chance to take their case to the townspeople. When the populace realizes that it was a romantic, non-sexual, relationship, they lose interest and the two are allowed to keep their jobs. Memorable moments include the announcements, firecrackers, Martin giving Nelson an invitation, Homer’s rocket ride for Bart and Milhouse, getting ice, Bart and Edna meeting at the party, the tea set, Skinner’s mom, the many instances of Bart covering for the lovebirds, Martin zinging Bart, Bart getting even, the kids’ tales, mortarboard, Skinner being told what to do, Kent Brockman being had, police tactics, Armour hotdogs, Chalmers’s summary of the townspeople, and Seymour’s and Edna’s continuing secret.