Watch an Internet Meme Go Horribly Wrong in the Trailer for HBO’s Beware the Slender Man Documentary

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In 2014, a scary internet fiction tragically overwhelmed reality when 12-year-olds Morgan Geyser and Anissa Weier stabbed a classmate in the woods after developing a fascination with Slenderman. The girls believed that it was necessary to prove that Slenderman, which began its life on the internet as a meme, existed, and that killing someone was the only way to do so. Fortunately, the victim survived, and the trial is still ongoing. The disturbing case is being explored in a true-crime documentary called Beware the Slender Man. The documentary, directed by Irene Taylor Brodsky, will air on HBO January 23. Watch its trailer above.

Watch Trailer for HBO’s Beware the Slender Man