- Papa Lazarou. Everything about him. Especially in the Christmas Special. He didn't wind up as the page image for the Nightmare Fuel Live-Action TV page for nothing.
- The Christmas Special also manages to turn Herr Lipp (normally a mid case of Paranoia Fuel) into a full-on terror, mostly through excellent camera work. Plus there was the creepy, masked cult and the Victorian curse. Who ever thought shadow puppets of a monkey screwing an elephant could be so scary?
- Harvey "Toadface" Denton becomes increasingly sinister and monstrous over the series, and yet he's got nothing on his twin daughters, Chloe and Radclyffe. Their Establishing Character Moment - involving a man trapped inside a scarecrow - is particularly well-remembered, as is their alarming pleasure at killing their father's beloved toads.
- As well as locking their parents in a room in the basement. It's implied that they never let them out again as they don't appear in the show afterwards.
- Edward and Tubbs, a pair of incredibly hideous, incestuous Corrupt Hick Serial Killers, as well as the implied metamorphosis of their son from a normal human being into a monstrous ogre-like creature that lives in the attic. Not something you expect to see on a Sitcom.
- Hilary Briss is mildly creepy all by himself, but the mysterious meats he sells (and the bizarre, dreamlike scene of him purchasing them from a dealer) are absolutely horrific.
- The creators were asked if his meat was human flesh... Their answer? No. It's so much worse than that.
- The Nosebleed Plague. Even Papa Lazarou was creeped out by that.
- The scene in the second series where Pauline and Ross wrestle features a moment where Pauline forces Ross onto a table and tries to stab him with a pen, all with a terrifyingly feral look on her face. This was immediately followed by Ross biting down on her breast hard with a sickening crunch!
- According to the movie, if at any point you stop writing about a fictional world, it is destroyed by a fiery hail of meteors—so, essentially, any time a series ends you're dooming not just your leads but dozens of incidental characters and extras, to say nothing of the countless people who implicitly populate the work's world, all of whom actually exist on another plane.
Nightmare Fuel / The League of Gentlemen
Often considered one of the creepiest Sit Coms ever made, The League of Gentlemen is rife with examples. Spoilers below.