On May 31, 2014, 12-year-olds Morgan E. Geyser and Anissa E. Weier allegedly stabbed a classmate 19 times. The Wisconsin preteens said their attack was inspired by Slender Man: a towering, faceless boogeyman who was created in an online forum.

The trial of the now-14-year-old girls is to be the subject of an upcoming HBO documentary that looks into the case—and the mythology behind Slender Man—and it looks absolutely bone-chilling. Even the trailer is as frightening as a horror movie. See for yourself…

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Beware The Slender Man premieres on January 23, 2017 and if that trailer is any indication, it’s going to send shivers down our spines.

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