CW: violence involving minors, themes of mental illness, delusion, and psychiatric hospitalization. Listener discretion advised. In this episode, Heather takes us back to 2014, when two twelve-year-old girls in Waukesha, Wisconsin, lured a friend into the woods and attacked her after becoming convinced they needed to prove themselves to the fictional internet figure known as Slender Man. We walk through how an online horror character created in 2009 grew into a widespread piece of internet folklore, and how those beliefs intersected with the girls’ lives. The episode also follows the legal outcomes and recent events involving a brief escape. Beware the Slenderman. Directed by Irene Taylor Brodsky, HBO Documentary Films, 2016. Broadcast on HBO, 23 Jan. 2017 Evan Casey, “Wisconsin woman who stabbed classmate in order to please Slender Man will be released to a group home,” Wisconsin Public Radio (WPR), July 17, 2025 Todd Richmond, “Slender Man stabbing victim’s family ‘nervous’ about release,” The Associated Press, Sept. 14, 2021 YouTube, “Bodycam Shows Arrest of ‘Slender Man’ Stabber Morgan Geyser: ‘I Did Something Really Wrong’,” published to YouTube, [video], https://youtu.be/anj5s5jAQgE. (Bodycam footage of her arrest after leaving custody.) Todd Richmond, “Wisconsin judge sends Slender Man attacker back to mental health institution after group home escape,” ABC7 Chicago (Associated Press), Dec. 23, 2025. Knudsen, Eric (Victor Surge). “Create Paranormal Images” thread. Something Awful Forums, June 2009. Dewey, Caitlin. “The complete history of ‘Slender Man,’ the meme that compelled two girls to stab a friend.” The Washington Post, June 3, 2014. Romano, Aja. “The definitive Slender Man story: how an urban legend went too far.” The Verge, June 3, 2014. Marble Hornets. Created by Troy Wagner and Joseph DeLage. YouTube series, 2009–2014. Federal Bureau of Investigation. Uniform Crime Reporting (UCR) Program. https://www.fbi.gov/services/cjis/ucr Ammo.com Research Team. Murders by Weapon Type in the United States. https://ammo.com/research/murders-by-weapon-type Clauset, Aaron, et al. “On the Distribution of Criminal Offenses,” arXiv. https://arxiv.org/abs/cond-mat/0402646 Brennan, Iain R., et al. Journal of Forensic and Legal Medicine. https://www.sciencedirect.com/science/article/pii/S1359178922000556 National Library of Medicine (PMC). Knife Crime Risk Factors. https://pubmed.ncbi.nlm.nih.gov/PMC7732065/