This weekend’s horror hits — Obsession (left) and Backrooms (right) — are bringing young people back into theaters, and already reshaping Hollywood. Photo-Illustration: Vulture; Photos: Focus Features/Everett Collection, A24 By most conventional movie metrics — budget, marketing, overall IP recognition — this weekend’s box-office showdown was a far cry from 2023’s Barbenheimer blockbuster battle royale. But the heads-up competition between two low-budget horror flicks, Backrooms and Obsession ,