Warning: This post contains major spoilers for Joker: Folie À Deux. It’s pretty unclear who exactly Joker: Folie à Deux is for. While 2019’s Joker earned more than $1 billion at the global box office and remains the highest-grossing R-rated film of all time, Folie à Deux doesn’t exactly run with the troubled-loner-enacts-violent-revenge-fantasy formula that helped make its predecessor such a success.