Out today in theaters nationwide, Joker is the tale of.. well, The Joker, and how he became The Joker. I think.. I dunno, it's kind of more slice-of-life than I was expecting, and I'm still trying to figure out exactly what I was supposed to get out of it....
BTW - AMC sci-fi movies has responded to the "no singles" viral picture and stated they have no such policy for screenings of Joker. I can't be certain that this is the be horror movies all end all for information regarding that particular picture that had made (blog post) it's way around the internet, but that's their story and they're sticking to it.
Source: JOKER Movie Review - Decker Shado