Ha.

Marcia Wallace died Friday at 70, of breast cancer. She’d been the voice of Edna Krabappel—The Simpsons’ perpetually disappointed fourth-grade teacher—since the second episode, which means she’d been doing that sardonic smoker’s laugh for longer than most of the show’s current audience has been alive.

Mrs. Krabappel was never the warm one. She graded papers with the exhausted contempt of someone who got into teaching for reasons she’d long stopped believing in. She smoked. She drank. She propositioned Homer. She had that laugh—Ha!—that managed to sound both mean and deeply, specifically sad. Marcia Wallace put something real in there, and it showed across twenty-four seasons.

Simpsons producer Al Jean said he’d learned of her passing with extreme sadness and that the character would be retired rather than recast—irreplaceable was the word he used, and it’s correct. You don’t hand that laugh to someone else.

Rest in peace, Mrs. Krabappel. You’ll be missed. Very much so.