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Warner Bros. Pictures

9 Horror Movies Inspired by Real-Life Events

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Warner Bros. Pictures

While most horror movies are complete works of fiction, the genre occasionally offers up stories that are based on terrifying and jaw-dropping real-life events, like the nine collected here.

1. A Nightmare on Elm Street

Premise: A supernatural killer stalks his prey while they dream during deep sleep. 

Real-Life Inspiration: Wes Craven based A Nightmare on Elm Street on a series of newspaper articles from the Los Angeles Times about a strange phenomenon where young Asian refugees would mysteriously die in their sleep. It was reported that many would refuse to sleep, citing terrifying nightmares that they feared would lead to death.

According to Craven, the paper "never correlated [the three articles], never said, ‘Hey, we’ve had another story like this'":

The third one was the son of a physician. He was about twenty-one; I’ve subsequently found out this is a phenomenon in Laos, Cambodia. Everybody in his family said almost exactly these lines: "You must sleep." He said, "No, you don’t understand; I’ve had nightmares before—this is different." He was given sleeping pills and told to take them and supposedly did, but he stayed up. I forget what the total days he stayed up was, but it was a phenomenal amount—something like six, seven days. Finally, he was watching television with the family, fell asleep on the couch, and everybody said, "Thank god." They literally carried him upstairs to bed; he was completely exhausted. Everybody went to bed, thinking it was all over. In the middle of the night, they heard screams and crashing. They ran into the room, and by the time they got to him he was dead. They had an autopsy performed, and there was no heart attack; he just had died for unexplained reasons. They found in his closet a Mr. Coffee maker, full of hot coffee that he had used to keep awake, and they also found all his sleeping pills that they thought he had taken; he had spit them back out and hidden them. It struck me as such an incredibly dramatic story that I was intrigued by it for a year, at least, before I finally thought I should write something about this kind of situation.

2. Child's Play

Premise: A serial killer's soul possesses a toy doll and wreaks havoc.

Real-Life Inspiration: In 1909, Key West painter and author Robert Eugene Otto claimed that one of his family's servants placed a voodoo curse on his childhood toy, Robert the Doll. Supposedly, the doll would mysteriously move from room to room, knock furniture over, and conduct conversations with Otto. Robert the Doll was left in the attic until Otto's death in 1974, when new owners moved into his Florida home. The new family also claimed mysterious activities would happen in the house connected to the doll. Today, Robert the Doll is on display at the Custom House and Old Post Office in Key West, Florida.

3. The Amityville Horror

Premise: A young family moves into a house where a murder was committed, and experiences strange and terrifying occurrences.

Real-Life Inspiration: Based on the book of the same name, The Amityville Horror follows the paranormal events that terrorized the Lutz family. In 1975, the family moved into 112 Ocean Avenue where, unbeknownst to them, Ronald DeFeo, Jr. had brutally murdered his family 13 months before they arrived. While in their new home, the family claimed that they saw green slime on the walls and red-eyed pigs staring into their kitchen and living room. After less than a month, the Lutz family moved out of the small town of Amityville, New York.

4. Psycho

Premise: A secretary goes on the run after she steals $40,000, only to wind up in a motel where the innkeeper and his mother are more than they appear to be.

Real-Life Inspiration: Psycho's Norman Bates is loosely based on convicted murderer and grave robber Ed Gein, who, during the late 1950s, killed women and unearthed corpses in Wisconsin. He also fashioned human skin into tiny keepsakes and knickknacks, such as face masks, belts, and chair coverings. Psycho's novelist Robert Bloch based Bates on Gein, but changed the character from a grave robber and murderer into a serial killer who dressed like his mother. The Texas Chainsaw Massacre and The Silence of the Lambs also based their serial killers—Leatherface and Buffalo Bill, respectively—on Gein.

5. The Exorcist

Premise: Two Catholic priests perform an exorcism on a young girl who is possessed by the devil.

Real-Life Inspiration: The Exorcist's author and screenwriter William Peter Blatty based the novel and film on a Washington Post article from 1949 headlined, "Priest Frees Mt. Rainier Boy Reported Held in Devil's Grip." The article followed Jesuit priests William S. Bowdern, Edward Hughes, Raymond J. Bishop, and Walter H. Halloran participating in the rite of exorcism on a boy with the pseudonym "Roland Doe" in Maryland. According to the priests, they allegedly experienced the boy speaking in tongues, the bed shaking and hovering, and objects flying around during the ordeal. The exorcism was one of three official Catholic Church-sanctioned exorcisms in the United States at the time.

"Maybe one day they’ll discover the cause of what happened to that young man, but back then, it was only curable by an exorcism," William Friedkin, the director of The Exorcist, told Time Out. "His family weren’t even Catholics, they were Lutheran. They started with doctors and then psychiatrists and then psychologists and then they went to their minister who couldn’t help them. And they wound up with the Catholic church. The Washington Post article says that the boy was possessed and exorcised. That’s pretty out on a limb for a national newspaper to put on its front page ... But you’re not going to see that on the front page of an intelligent newspaper unless there’s something there."

6. The Girl Next Door

Premise: An aunt tortures and abuses her niece, and a neighborhood boy fails to alert the authorities.

Real-Life Inspiration: Based on Jack Ketchum's novel of the same name, The Girl Next Door is based on the murder of Sylvia Likens, a 16-year-old girl from Indiana in 1965. Sylvia and her sister Jenny were left in the care of Gertrude Baniszewski, a family friend, when their parents left town as traveling carnival workers. Baniszewski, along with her children and a few neighborhood kids, locked Sylvia in the basement, where they tortured and abused her until she died of a brain hemorrhage and malnutrition.

7. The Conjuring

Premise: Two paranormal investigators help a family who move into a secluded home plagued by weird events.

Real-Life Inspiration: The Conjuring is based on real-life paranormal investigators Ed and Lorraine Warren and their experience with the Perrons, a family who moved into a Rhode Island farmhouse and experienced ghostly and terrifying occurrences in 1971.

"When Insidious came out and was successful the story about the Warrens came to me and I was like, 'Oh, my gosh, this is really cool,'” director James Wan told Entertainment Weekly in 2013. "But I didn’t just want to make another ghost story or another supernatural film. One thing I had never explored was the chance to tell a story that’s based on real-life characters, real-life people. So those were the things that led me to The Conjuring."

The Warrens also had a possessed Raggedy Ann doll that was the inspiration for the spin-off film Annabelle. Allegedly, a demon spirit possessed the Raggedy Ann doll, which is currently on display and under lock and key at the Warrens' Occult Museum in Monroe, Connecticut.

8. Open Water

Premise: Two scuba divers become stranded in shark-infested waters after their tour group accidentally leaves them behind.

Real-Life Inspiration: Open Water is based on American tourists Tom and Eileen Lonergan, a couple who were lost at sea when their tour group left them behind while scuba diving near the Great Barrier Reef in Australia in 1998. When the diving company realized the mistake two days later, they organized a search party, but the Lonergans were never found. The only thing that was found was a diver's slate (an underwater communication device) with a S.O.S. message on it that read, "[Mo]nday Jan 26; 1998 08am. To anyone [who] can help us: We have been abandoned on A[gin]court Reef by MV Outer Edge 25 Jan 98 3pm. Please help us [come] to rescue us before we die. Help!!!"

9. The Blob

Premise: A mysterious alien life-form terrorizes a small town and consumes everything in its path as it grows bigger and bigger.

Real-Life Inspiration: Believe it or not, The Blob is based on a New York Times article from 1950 titled, "A ‘Saucer’ Floats to Earth And a Theory Is Dished Up." The story followed four Philadelphia police officers who came into contact with a strange gooey material, which is now believed to be "Star Jelly," a transparent gelatinous substance. When one of the officers tried to move the goo, it started to dissolve and evaporate, so there was nothing to show the FBI when they arrived on the scene except a spot on the ground.

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iStock // Ekaterina Minaeva
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Man Buys Two Metric Tons of LEGO Bricks; Sorts Them Via Machine Learning
May 21, 2017
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iStock // Ekaterina Minaeva

Jacques Mattheij made a small, but awesome, mistake. He went on eBay one evening and bid on a bunch of bulk LEGO brick auctions, then went to sleep. Upon waking, he discovered that he was the high bidder on many, and was now the proud owner of two tons of LEGO bricks. (This is about 4400 pounds.) He wrote, "[L]esson 1: if you win almost all bids you are bidding too high."

Mattheij had noticed that bulk, unsorted bricks sell for something like €10/kilogram, whereas sets are roughly €40/kg and rare parts go for up to €100/kg. Much of the value of the bricks is in their sorting. If he could reduce the entropy of these bins of unsorted bricks, he could make a tidy profit. While many people do this work by hand, the problem is enormous—just the kind of challenge for a computer. Mattheij writes:

There are 38000+ shapes and there are 100+ possible shades of color (you can roughly tell how old someone is by asking them what lego colors they remember from their youth).

In the following months, Mattheij built a proof-of-concept sorting system using, of course, LEGO. He broke the problem down into a series of sub-problems (including "feeding LEGO reliably from a hopper is surprisingly hard," one of those facts of nature that will stymie even the best system design). After tinkering with the prototype at length, he expanded the system to a surprisingly complex system of conveyer belts (powered by a home treadmill), various pieces of cabinetry, and "copious quantities of crazy glue."

Here's a video showing the current system running at low speed:

The key part of the system was running the bricks past a camera paired with a computer running a neural net-based image classifier. That allows the computer (when sufficiently trained on brick images) to recognize bricks and thus categorize them by color, shape, or other parameters. Remember that as bricks pass by, they can be in any orientation, can be dirty, can even be stuck to other pieces. So having a flexible software system is key to recognizing—in a fraction of a second—what a given brick is, in order to sort it out. When a match is found, a jet of compressed air pops the piece off the conveyer belt and into a waiting bin.

After much experimentation, Mattheij rewrote the software (several times in fact) to accomplish a variety of basic tasks. At its core, the system takes images from a webcam and feeds them to a neural network to do the classification. Of course, the neural net needs to be "trained" by showing it lots of images, and telling it what those images represent. Mattheij's breakthrough was allowing the machine to effectively train itself, with guidance: Running pieces through allows the system to take its own photos, make a guess, and build on that guess. As long as Mattheij corrects the incorrect guesses, he ends up with a decent (and self-reinforcing) corpus of training data. As the machine continues running, it can rack up more training, allowing it to recognize a broad variety of pieces on the fly.

Here's another video, focusing on how the pieces move on conveyer belts (running at slow speed so puny humans can follow). You can also see the air jets in action:

In an email interview, Mattheij told Mental Floss that the system currently sorts LEGO bricks into more than 50 categories. It can also be run in a color-sorting mode to bin the parts across 12 color groups. (Thus at present you'd likely do a two-pass sort on the bricks: once for shape, then a separate pass for color.) He continues to refine the system, with a focus on making its recognition abilities faster. At some point down the line, he plans to make the software portion open source. You're on your own as far as building conveyer belts, bins, and so forth.

Check out Mattheij's writeup in two parts for more information. It starts with an overview of the story, followed up with a deep dive on the software. He's also tweeting about the project (among other things). And if you look around a bit, you'll find bulk LEGO brick auctions online—it's definitely a thing!

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