Joker: Folie à Deux” is falling flat after earning a “D” CinemaScore, the lowest grade ever from the research film for a comic book movie. The previous record holder was 2015’s “Fantastic Four,” which received a “C-” CinemaScore.

The worst score ever received by for a comic book film. Joker: Folie à Deux Earns Historically Low “D” CinemaScore

Folie à Deux to put on a happy face this weekend because the sequel's box office prospects are worsening courtesy of a terrible D CinemaScore.