Before the month of October, if anyone had predicted that Joker: Folie à Deux would fall from No. 1 after only a single weekend to another killer clown movie then it would have been easy to dismiss. And yet that’s exactly what happened as Terrifier 3 is the new U.S. box-office champion with $18.3 million (via Deadline) in its opening weekend. As for the Joker sequel, it fell to third place behind The Wild Robot’s $13.45 million, which brings the DreamWorks Animation film to $83.7 million to date.There were warning signs about Folie à Deux’s box office prospects before it opened to a disappointing $37.7 million, which was far behind the $96.2 million that Joker had in its opening weekend in 2019. For its second weekend, Joker: Folie à Deux fell 81% to only $7.055 million. To put this in …