Joker: Every Death Ranked
1. The Waynes
In one of the film's biggest shocks - considering we were told this wouldn't be a Batman movie in the strictest terms - comes right at the end when Joker's murder of Murray inspires the clown uprising that turns Gotham over to the mob. We get Batman's origin thrown in.
By this point, Thomas Wayne has been outed as a monster who thinks of the poorer classes as "clowns" who need to be "fixed" and who Gotham needs to be saved from. He and his family are caught in the mob uprising and a protestor recognises him, follows him into that fateful backalley and shoots him and his wife. The film's mantra of Kill The Rich comes full circle.
Ultimately, it COULD be a fantasy by Arthur, because there's no way he could have witnessed it, but it's a brilliant way of setting up Batman's story and if they don't tie the Dark Knight to this version of the Joker, they'll be missing a trick.