Christian Bale's voice as Batman in the "Dark Knight" trilogy is infamous - and infamously bad for the vocal cords - but as it turns out, Joaquin Phoenix's unhinged laugh as Arthur Fleck in the "Joker" films was also a bit of a health hazard.

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

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.

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:

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,