The movie trailer so terrifying it's making cinema audiences gasp.

Well, this is spooky.

There’s a trailer screening in movie theatres across Australia right now and it’s making audiences gasp.

It’s the preview for Slender Man, the supernatural horror movie loosely-based on the Slender Man urban legend and the Slender Man attempted murder.

The Slender Man trailer is so spooky it’s making audiences gasp. Post continues. 

In the movie, five teenage girls perform a ritual to summon an evil spirit. What they end up summoning is Slender Man, a tall, thin other-worldly figure without a face.

Slender Man begins to haunt the teenage girls and one-by-one they start to disappear.

In a particularly terrifying part of the trailer – which continues to shock unsuspecting audiences – a teenage girl is sitting in a science class holding a scalpel. She stares at it intently, before violently stabbing herself in the face, splattering her classmates in blood.

It’s… it’s not what you’re expecting when you’re just getting into your popcorn before your movie starts.

Slender Man is an internet meme which originated on the Creepypasta website and forum. But what started out as a submission to a creepy illustration competition, soon turned into an urban legend.

People started to report sightings of the Slender Man and he gained a cult-like following online.

Just four years ago in two separate incidents American pre-teenage girls committed horrifying, violent acts in the name of Slender Man.

Morgan Geyser and Anissa Weier, both 12, stabbed their friend Payton Leutne, also 12, in a Wisconsin forest. Leutne survived the attack and Geyser and Weier were charged with her attempted murder.

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In the same year, a 13-year-old girl in Ohio attacked her mother with a knife.

Each of the girls claimed the Creepypasta meme made them do it.

Without directly referencing these incidents, the movie will explore the Slender Man meme’s influence on young, vulnerable girls.

It’s sure to be a spooky and confronting watch.

The movie will be released in Australian cinemas in August this year. Will you be watching?