What do you think this reviewer is referring to (about the ending)?...
In a Vulture review of the movie, the reviewer states: "Mostly, Folie à Deux plays as a middle finger to anyone who sought something meaningful in it. I won’t spoil anything specific, but I will say that the ending of the film—which is the first time anything truly happens in the whole movie—is bound to enrage even the most die-hard of Joker believers."
What do you think that is, that is bound to enrage us fans??