Joker Folie agrave Deux (2024) 

Synopsis

After murdering Murray Franklin live on television, Arthur Fleck is incarcerated in Arkham State Hospital, where he meets Harleen Quinzel. The two fall madly in love and experience musical madness through their shared delusions, while Fleck's followers start a movement to free him from Arkham, ultimately giving rise to the Clown Prince of Crime's criminal empire.