Joaquin Phoenix's laugh as Arthur Fleck apparently took a toll on the actor during 'Joker: Folie à Deux' production.

Joker and Harley Quinn are sharing their madness with Gotham City as mayhem reigns in the trial of Arthur Fleck.

Folie à Deux trailer is out, previewing the upcoming sequel to 2019’s hit film starring Joaquin Phoenix. What happens in the Joker: Folie à Deux trailer? The new trailer highlights more of the relationship between Arthur Fleck (Phoenix) and Harley Quinn (Lady Gaga),

What we know about Joker: Folie à Deux is limited, but that'll change when it hits theaters in October. And while Joaquin Phoenix encouraged Gaga to sing poorly, that's simply not the case in the final Joker 2 trailer. Mother Monster shared th enw clip on her Instagram, check it out below:

Warner Bros. Pictures So far, we’ve seen a lot of little bits of the movie Joker: Folie à Deux in the various trailers that have been released, but now’s your chance to see Lady Gaga actually act with

That certainly looks to be the idea in the latest trailer for Todd Phillips all-singing, all-dancing movie with music Joker: Folie À Deux, which sees Joaquin Phoenix's Arthur Fleck taking to the stand as he goes on trial for the televised killing of Murray Franklin (Robert De Niro) in Joker.

Lady Gaga is already making naysayers eat their words with just the teaser of Harley Quinn in Joker: Folie à Deux.

Joker: Folie à Deux. The 60-second video features Lady Gaga's Harley Quinn visiting an emaciated Arthur Fleck, or Joker, played by Joaquin Phoenix, who is in a mental institution. Before she leaves, she pulls out a red lipstick and smears a clownish grin,