I would argue that this photo of Caesar Romero, on a break from filming 1966’s Batman, in which ironically he plays a humorous, campy version of the character, is the creepiest depiction of The Joker I’ve ever seen.
Because he’s not wearing a garish costume and sporting green hair, and looks both mundane and deeply unsettling.
Andréa cites not the comic itself, but the name on the window.
I have a fairly good guess, but it’s not clear why the Joker is calling Batman that.
Unless I’m looking for more than what’s here, which is why I’m posting this mid-day.
Three people sent me this one, with a total of three Arlo recommendations, two Ewww’s, and one The @!!# Squirrel Must Die!