Backrooms Movie Just Made History — A24's First $100M Film Came From a 20-Year-Old YouTuber

How a Viral YouTube Series Became A24's Biggest Movie Ever

If you told anyone two years ago that a movie based on a creepy internet meme about empty yellow hallways would become the biggest box office hit of summer 2026, they would have laughed in your face. Well, nobody's laughing now — because A24's Backrooms just crossed $100 million at the domestic box office in a staggering six days, becoming the independent studio's highest-grossing film in U.S. history.

Let that sink in. This isn't a Marvel movie. It's not a Star Wars sequel. It's a horror film based on a YouTube web series — and it just obliterated every record A24 has ever set.

The Numbers That Broke Hollywood

Backrooms earned a jaw-dropping $81 million domestically and $118 million globally during its opening weekend alone. To put that in perspective, it more than tripled the previous A24 opening weekend record of $25.5 million, which was held by Alex Garland's Civil War (2024). It also surpassed the domestic total of Marty Supreme — the Timothée Chalamet period dramedy that previously held the crown at $96 million.

Even more impressive? This is now the biggest opening weekend ever for an original horror film in cinematic history. Not a franchise entry. Not a sequel. A brand-new horror IP that didn't exist as a major studio property until Kane Parsons decided to turn his viral concept into a feature film.

From YouTube Sensation to Box Office Champion

Here's what makes this story truly insane: the director, Kane Parsons, is only 20 years old. He created the original Backrooms YouTube videos that went massively viral, and now he holds the record as the youngest filmmaker ever to have a #1 film at the box office, surpassing the previous record set by Josh Trank in 2012 with Chronicle.

The film stars Chiwetel Ejiofor (12 Years a Slave, Doctor Strange) as a furniture store owner who discovers a hidden doorway leading into an endless labyrinth of eerie, yellow-wallpapered liminal spaces. When he disappears, his therapist — played by Renate Reinsve (The Worst Person in the World) — must venture into the unsettling maze to find him. It's exactly the kind of concept that works brilliantly on screen: familiar yet deeply uncanny.

The production brought together Chernin Entertainment, 21 Laps Entertainment, and Atomic Monster — three powerhouse production companies that clearly saw the potential in Parsons' vision. And the gamble paid off spectacularly.

What This Means for A24 and Horror Movies

For years, A24 built its reputation on arthouse gems and critically acclaimed indie films like Everything Everywhere All at Once, Hereditary, and The Witch. Backrooms proves that the studio can also dominate the mainstream box office without sacrificing its creative identity.

With Scary Movie 6 and Masters of the Universe also making waves this summer, 2026 is shaping up to be one of the most exciting years at the box office in recent memory. But Backrooms? It's the surprise champion nobody saw coming — and it might just change how Hollywood thinks about internet-born IP forever.