Folie à Deux, and when I asked about Joaquin Phoenix’s Southern accent while he was representing himself in the courtroom scenes, Phillips said this: That was our idea in the script. We put it in, Scott Silver and I.

This story includes details about the ending of "Joker: Folie à Deux' The murder trial at the center of "Joker: Folie à Deux" ends in explosive fashion: A bomb goes off and destroys the courtroom after Arthur Fleck (Joaquin Phoenix) decides to defend himself and confesses that the Joker is not some split personality of his.

Folie à Deux." There are a lot of controversial elements to the long-awaited sequel to "Joker," but maybe the biggest one is the reveal that Joaquin Phoenix's Arthur Fleck isn't really the Joker we all know and love.