Mr. Show's 1998 sketch "Monster Parties: Fact or Fiction?" has a fascinating conceit: what if "The Monster Mash" was non-fiction? This eight-minute comedic tour de force is a pitch-perfect imitation of Unsolved Mysteries-style documentaries

Yeah, I know this is old, but everyone should watch this once before they die. Also, we've had maybe two decent Halloween novelty song sketches in the history of human comedy (it's between this and "Werewolf Bar Mitzvah", which is 10 seconds long).