Family Matters -- Urkel's Satanic Doll Doppelganger Murders Everyone
Family Matters was ostensibly a sitcom about the elevator operator from Perfect Strangers, Harriette Winslow, and her cop husband, but it soon became centered on their impossibly annoying nerd neighbor, Steve Urkel. In a season 8 Halloween episode, Urkel decides he wants to become a ventriloquist and gets a doll that looks like a smaller plastic version of him, which is a terrifying enough premise, but then things start getting more batshit insane by the minute.
"I hide in plain sight, Mr. White."
Early in the episode, Urkel's doll gets struck by lightning and comes alive. The doll, "Stevil," talks in a satanic voice and informs Urkel that he is going to murder the Winslow family. And then he totally fucking does it: He sucks Eddie into the chimney, runs down the kids in Urkel's car, dismembers Laura and hides her body parts in the cupboards, and finally decapitates the mom and turns her into a goddamn jack-in-the-box.
Which is a legitimately impressive achievement for someone with rigid plastic fingers.
Urkel is relieved to find Carl in one piece and tries to explain what happened, but realizes that the man is sounding a little weird -- at this point, Carl falls to the side, dead, revealing that Stevil has been using him as a human puppet.
We really hope he cut open a new hole to do that.