Image Credit: Courtesy of A24 Backrooms, A24's upcoming horror, is already frightening horror enthusiasts. Following the release of its trailer, fans are cowering in their seats before they get to theaters, and some are wondering where the found-footage sci-fi got its inspiration. It turns out that the movie derives from an old 4chan thread, in which a user conceptualized the fear of "backrooms" in fluorescent, "mono-yellow" empty rooms. So, what exactly is the movie about? Here, Hollywood Life breaks down everything we know about the 2026 Backrooms horror movie.