Folie à Deux"? Joaquin Phoenix, Lady Gaga and director Todd Phillips break down the wild ending and Gaga's triumphant song.

Dieck as the Joker, alongside Mueller as Harley Quinn, ambushed Capital Indoor Stadium Friday with a chaotic rhythm dance that would make Commissioner Gordon do the twizzles. The dastardly German duo ...

Joaquin Phoenix and Lady Gaga star as Arthur Fleck and Harley Quinn, respectively, in Todd Phillips' sequel to "Joker." ...