In theaters on June 8, 2018, Hereditary is being buzzed as the scariest horror film in years. Our own Fred Topel loved the film, calling it “psychologically and viscerally grueling,” while Trace proclaimed that it “rewards your patience with nightmare fuel.”

Not exactly the kind of film you’d take a child to see, is what I’m getting at. But parents at Event Cinemas in Innaloo, Western Australia had no choice earlier this week, when the trailer for Hereditary was accidentally shown before animated film Peter Rabbit. Oops.

Naturally, both children and parents alike were horrified.

“It was dreadful. Very quickly you could tell this was not a kid’s film,” an audience member told the Sydney Morning Herald. “Parents were yelling at the projectionist to stop, covering their kids’ eyes and ears. A few went out to get a staff member but she was overwhelmed and didn’t really know what to do. Some parents fled the cinema with their kids in tow.”

She added, “A lot of the kids were upset. If you think back to your own childhood you remember things that scared you when you saw them for the first time.”

Staff at Event Cinemas eventually shut the trailer off midway through, and made up for their mistake by offering complimentary movie passes for subsequent visits.

In Hereditary…

“When Ellen, the matriarch of the Graham family, passes away, her daughter’s family begins to unravel cryptic and increasingly terrifying secrets about their ancestry. The more they discover, the more they find themselves trying to outrun the sinister fate they seem to have inherited. Making his feature debut, writer-director Ari Aster unleashes a nightmare vision of a domestic breakdown that exhibits the craft and precision of a nascent auteur, transforming a familial tragedy into something ominous and deeply disquieting, and pushing the horror movie into chilling new terrain with its shattering portrait of heritage gone to hell.”

Toni Collette, Gabriel Byrne, Alex Wolff, Ann Dowd, and Milly Shapiro star.