This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / Nights at the Circus
The main character is led through a hallway filled with jeweled eggs, each of which contain the life of a woman murdered by the person leading her, while an ice sculpture of her melts into a spread of caviar and an animatronic orchestra plays really creepy music. Three chapters later, a group of tigers are fused with mirrors to form sentient shards of glass with orange stripes that are hot to the touch.
Earlier in the book, there is a long scene involving being raped inside a Megalithic tomb, a woman with eyes on her chest, a girl whose face is permanently covered in cobwebs, a seemingly normal (but not particularly nice) character who turns out to be a gigantic, demon-possessed doll, a man who delivers a three-page rant about obscure rites and cults before trying to sacrifice the main character to the Earth Goddess while children play in his front yard, and a comatose woman over whom another character, who is winged, hunches holding a sword for a very long time. Remember, this is in a single chapter. And this is probably her least creepy book. It should come as no surprise that one of Carter's main literary influences was the Marquis de Sade.
The clowns. Next to Buffo's Last Supper, all the rest is just scenery.