For some, feel-good Halloween films like Hocus Pocus and Halloweentown are a must-watch each and every year. But for others, they require something just a wee bit scarier. 

Horror films are, of course, horrifying, but nothing quite sends a chill down your spine like a real-life horror documentary. Why? Because these terrifying events actually happened. 

This is your fair warning — these films are not for the faint of heart. 

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1. My Amityville Horror (2012)

Did you know there's a true story behind the wildly successful film franchise? Daniel Lutz recounts his experiences of the Amityville Haunting that horrified his family throughout 1975. 

2. This Is the Zodiac Speaking (2008)

This documentary follows the investigations, interviews, and victims surrounding one of America's most notorious serial murderers, The Zodiac Killer, whose identity remains unknown to this day.

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3. Cropsey (2009)

This film starts out as an investigation of "Cropsey," an urban legend detailing a character similar to the boogeyman. The film then launches into the tale of Andre Rand, a convicted kidnapper. 

4. I Know What I Saw (2009)

This made-for-television documentary highlights the most credible UFO sightings around the world and includes interviews with government and military personnel who reveal what they know about the controversial subject.