The film has years of internet lore backing up its premise

What evil lurks in the drabbest of interiors? The meme-rooted “Backrooms” is the latest movie to pull its mounting horrors out of liminal spaces.

Produced by James Wan and Osgood Perkins, the film adapts director Kane Parsons' own series of shorts set in an extra-dimensional maze of office-like rooms and hallways.