The Simpsons - Season 29, Episode 04: Treehouse of Horror XXVIII
Grampa finally hears what everyone is saying about him when he gets a hearing aid. Bart and Lisa break into the school to correct her astronomy test. They find Skinner there who opens up about his mother's betrayal which ruined his life.
All three segments in this year's special were strong. The series finally plugged two major holes in its huge collection of horror movie parodies while also reminding us that it can offend and disturb with the best of them.
Freed up from the need to calibrate the heart-yucks equation, a "Treehouse Of Horror" rises or falls on the strength of its jokes, although the annual Halloween anthology provides its own unique degree of difficulty.