Un Lun Dun/YMMV


 * Complete Monster: the Smog, Giraffes, and the Black Windows
 * Nightmare Fuel: The book provides an illustration of the carnivorous giraffes.
 * The description of the Black Windows. First, there's one. And then a few more climb out it, a few more climb out of them, and a few more climb out of them, until the room is filled with them! The bad part? They'll eat any intruders. The worse part? It's impossible to get out once you've been eaten. The absolute worst part?! You can sometimes hear the screams and banging of the recently-eaten.
 * High Octane Nightmare Fuel: Giraffes. They're the top predator in the outskirts of Un Lun Dun. Also, the Black Windows, which is what you'd get if you crossed spiders, windows, an Eldritch Abomination, and Alien Geometries. They start out as one Black Window, and then one climbs out of it, and then two climb out of each, and then three climb out of each of those, and so on until there are thousands., all climbing and clicking and screaming. Though the screaming isn't from the windows themselves. It's from the people trapped inside.