Now that the Joker 2 trailer is out, fans are wondering if the events in Folie à Deux are actually happening. Are they fake and imaginary, akin to a dream or a delusion? Is it all in Arthur and Harley’s heads? Here’s everything you need to know.

While the events in Joker 2 are likely real, some of them could be a delusion on the part of both Joker and Harley.

With the ending of the first Joker, director Todd Phillips kept the audience guessing. It all seemed real until Arthur Fleck proved to be an unreliable narrator. There were several events that he imagined in his head that didn't actually happen.

For example, his relationship with Zazie Beetz's Sophie wasn't real, which sent viewers into a spiral of wondering if everything in Joker was real or if it was all in his head. Was it all just a joke he told his therapist? Ultimately, that was left up to the viewers' interpretation.