Most episodes of The Simpsons are set in Springfield, but the show’s darkest Christmas outing proved just how little viewers know about the town’s citizens. The Simpsons is not always consistent, with its showrunner Matt Selman even addressing its “elastic canon” on Twitter from time to time. However, the show’s characters are pretty reliable. Homer is always a well-meaning buffoon, Lisa is always smart but naive, and Bart is always a rebel with a secret sweet side. That said, the rest of their hometown’s inhabitants aren’t quite so consistent from episode to episode, as evidenced by one contentious holiday special.