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!