This Sunday’s episode of The Simpsons sounds fairly rote—Bart does a bad thing then gets punished, with possibly hilarious results. There’s even a celebrity voice cameo, as Absolutely Fabulous’ Jennifer Saunders will lend her vodka-lined pipes to some character within that tale. Ahead of all that been-there-done-that, The Simpsons will air a couch gag that spans the show’s 600-plus episode history, that all starts with a Big Bang Theory-inspired riff: