I've seen some pretty creepy things in comics: Vertigo horror scenes, Jonah Hex body counts, and the costumes designs of Todd McFarlane.
But I have never
seen a panel that creeped me out more than this one, a panel that still haunts me decades after first seeing it:
That's not the Joker in the foreground; it's the nightmarishly powerful Composite Superman himself, disguised as a statue of the Joker housed in the Batcave.
You can criticize the drawing technique and anatomical accuracy of the Old Comic Masters all you want ... but they understood composition. Oh, yes.