John Wayne Gacy is understandably creepy, but it goes deeper than you'd think. For this list, we’ll be looking at the most unsettling truths about one of America’s most infamous serial killers. Our countdown includes The Crawl Space, His Last Words, The Attack on Donald Voorhees, and more! Which of these facts disturbs you the most? Let us know in the comments below.

Watch more videos on serial killers here:
10 Creepiest Things Serial Killers Have Ever Said: https://youtu.be/746n7xSIMag
10 Creepiest Jeffrey Dahmer Interview Moments: https://youtu.be/0_2OMZ9-Z2o
10 Times Serial Killers Were Caught in the Act: https://youtu.be/3Rk-0usxBwk

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