Beware the Slenderman (HBO)
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It was a local story that horrified the nation: two 12-year-old girls lured a friend into the Waukesha woods, where they proceeded to stab her 19 times in an effort to appease a faceless mythical entity known online as 'Slenderman.' This sobering documentary delves deep into the story and examines how an Internet urban myth could take root in impressionable young minds.