A very cool artistic rendering of the zombie versions of Springfield attacking the Simpsons as Apu tries to drive them to the safe zone.
As part of the Treehouse of Horror XX, Bart kills Skinner as a favor to Willie. Trust us, it made sense in the context of the episode.
When Marge thinks that Homer is dead, like any good friend, Moe uses his blood to attempt to seduce his recently widowed wife. Oh that Moe.

The Simpsons Season 21 Episode 4 Quotes

Lisa Simpson in detention? My horoscope told me I'd see something interesting today, but I thought that'd be the horoscope itself

Principal Skinner

Lighten up ladies, it's not cheating if you're wearing a costume

Homer Simpson