I want to see the real you,” Arthur Fleck’s new girlfriend tells him as she applies clown makeup to perk up his wretched face in “Joker: Folie à Deux.” She, a fangirl and fellow inmate at the state mental hospital whom he meets in a music-therapy class,

The average sequel to a huge commercial success doesn’t try much of anything. Director Todd Phillips knows this. He is, after all, the director of all three “Hangover” movies. Surprise! “Joker: Folie à Deux” is a lot of things,