Credit: Matt Nettheim

Australian horror film The Babadook has received widespread critical acclaim—and it’s also won over a man who knows something about terror. William Friedkin, the director of The Exorcist, is singing the film’s praises on Twitter, explaining he’s “never seen a more terrifying film.” And that comes from the man who directed what EW critic Chris Nashawaty recently deemed the “scariest” movie of all time.

Friedkin has also become an advocate for a wider distribution of the film, which follows a mother and son who encounter a pop-up book named for the titular monster.

Directed by Jennifer Kent, the film was awarded the Best First Film prize by the New York Film Critics Circle Monday.