This Harley Quinn Trivia Is No Joke — Solve It Before "Joker: Folie à Deux" Hits Theaters

"Joker: Folie à Deux", the sequel to the Joaquin Phoenix-led "Joker," hits theaters Oct. 4, and this time he has a leading lady by his side: none other than the little monster herself, Lady Gaga, who comes in to this film as henchwoman Harley Quinn. After her knockout performances in "A Star Is Born" and "House of Gucci," plus her "American Horror Story" stints, we're very pleased that Gaga is back on screen. What do you know about the character she's taking on?