It's Halloween season, which means all the usual trappings that come with this time of year: pumpkins, corn mazes, shockingly-early Christmas advertisements, and the annual "Treehouse of Horror" episode of The Simpsons. "Treehouse of Horror" is a pillar of The Simpsons, referred to by The AV Club as "a reliably inventive exercise in non-canonical Simpsons …

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