Folie à Deux," Joaquin Phoenix stayed in full makeup even when the cast was workshopping a scene. That left one unsuspecting parent in full panic mode. "Joaquin suggested, as a joke, that we FaceTime my mum and scare her,

Folie À Deux as Assistant DA Harvey Dent, and the actor has now spoken about bringing a new take on the classic Batman villain to the

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.

Folie à Deux character's name on set. While speaking with Variety about the upcoming comic book movie sequel, actor Harry Lawtey said that Phoenix, 49, "suggested, as a joke, that we FaceTime my mum and scare her" during a rehearsal — while the Academy Award winner remained in full clown makeup for the role.