Backrooms has quietly crossed $400 million worldwide — and it’s not even in the same conversation as the blockbusters. The psychological horror debut from Kane Parsons, a film that slipped past most radar screens, has outgrossed Sydney Sweeney’s biggest hit to date, The Housemaid, which pulled in $400.5 million. That’s not a typo. Backrooms is now the fifth-highest-grossing independent film of all time globally, and second-highest in the horror category this year. It’s also sitting at #11 on the 2026 global grossers list, just behind Obsession. No fanfare. No red carpet. Just numbers stacking up in silence. The film earned $81.4 million in its opening weekend domestically, followed by over $197.5 million in North America. Internationally, it cleared $200 million, pushing the total past $400.7 million. The story? A furniture store owner (Chiwetel Ejiofor) and his therapist (Renate Reinsve) stumble into a labyrinth of endless, liminal spaces beneath their basement. They don’t escape. Neither did audiences. The movie was released on May 29. And yet, while The Housemaid. An erotic thriller with a sequel already in development, got the spotlight, Backrooms played in the shadows. Now, it’s the one with the cash. The real question isn’t how it did it. It’s why no one saw it coming.