10 Scariest Movies Of All Time, According To Science

Science has officially determined the scariest horror movies of all time, and the results are fascinating. Horror is one of cinema's most subjective genres, and as such, audiences perennially disagree about which movies are the scariest ever. Yet it’s this subjectivity that makes the genre so thrilling. While some might be terrified by supernatural hauntings, others prefer psychological horror, and many would argue that nothing beats a particularly effective jump scare. Though critics' rankings and audience polls can provide interesting perspectives, neither quantifies how frightening a movie actually is. Fortunately, science has found a way. The annual Science of Scare study, conducted by MoneySuperMarket, attempts to identify cinema's most terrifying experiences by monitoring viewers' physical reactions. Its researchers equipped 250 participants with heart-rate monitors, measuring average heart rate, heart-rate variability (HRV), and peak heart-rate spikes while they watched a selection of horror movies. These measurements are combined into a Scare Score out of 100, accounting for both sudden shocks and sustained psychological tension. Interestingly, the Science of Scare’s top 10 is entirely populated by modern horror movies, with the oldest dating to 2005. Although classics such as The Exorcist and The Shining are considered far superior horror movies, it seems that doesn't necessarily make them more frightening, with modern horror being deemed the most scientifically frightening. 10 Talk To Me (2022) Talk to Me scored 75 out of 100, tying for tenth place in the Science of Scare rankings. Talk to Me depicts a group of teenagers who discover an embalmed hand that allows them to communicate with the dead – provided they follow a strict time limit. Unsurprisingly, their recreational supernatural experimentation quickly becomes something considerably more dangerous. Talk to Me's most disturbing scenes are when Mia becomes dependent on the experience. The moment when she contacts her deceased mother is especially upsetting. The possession sequence involving Riley is especially horrific. The teenagers' seemingly harmless party game turns into an extended ordeal of self-harm and supernatural violence. Talk to Me’s scariest events aren’t necessarily what emerges from the spirit world, but how easily ordinary people can become complicit in something monstrous. 9 The Exorcism Of Emily Rose (2005) The Exorcism of Emily Rose’s harrowing combination of supernatural horror and courtroom drama achieved a Scare Score of 76. This is likely bolstered by the knowledge that it is based on the horrifying real-life case of Anneliese Michel. Jennifer Carpenter plays Emily, a young woman whose increasingly disturbing experiences lead to an attempted exorcism by Father Richard Moore (Tom Wilkinson). Rather than relying exclusively on conventional demonic imagery, Emily's possession is frightening because of Carpenter's extraordinary physical performance. Her contorted movements, unnaturally positioned limbs, and desperate vocalizations are genuinely unsettling. The infamous bedroom sequence, in which Emily experiences terrifying manifestations during the night, is particularly effective. The decision to frame the story around the real legal investigation introduces an uncomfortable ambiguity. The audience is forced to consider whether Emily suffered from a supernatural affliction or a medical condition. 8 Smile (2022) Image via MovieStillsDB Smile earned a Scare Score of 78, truly demonstrating the effectiveness of a simple but disturbing horror concept. Sosie Bacon stars as Rose Cotter, a psychiatrist who witnesses a patient's horrifying suicide before becoming convinced that an unseen entity is following her. The creature's defining characteristic is its enormous, unnatural smile. It transforms an otherwise familiar human expression into something deeply threatening. Rose repeatedly encounters people wearing these unsettling grins, including individuals who appear completely ordinary until their expressions suddenly change. One particularly effective sequence involves Rose attending a family gathering, where an apparently familiar face becomes the source of a disturbing revelation. Smile also makes excellent use of empty spaces, background movement, and carefully timed visual surprises, encouraging viewers to question everything Rose (and they) see. 7 Smile 2 (2024) Smile 2 actually scored higher than its predecessor, earning a Scare Score of 79 points. This time, Naomi Scott plays Skye Riley, a pop superstar whose carefully managed public image begins collapsing after she encounters the same supernatural curse. The entertainment industry's obsession with celebrity image provides an especially effective setting. Skye is surrounded by people, constantly photographed and expected to maintain a reassuring public persona, even as her private life becomes terrifying. Smile 2 also makes the most of some truly elaborate hallucinations, particularly a sequence in which Skye encounters a group of seemingly identical dancers. Their synchronized movements and threatening behavior turn an ordinary performance environment into something utterly nightmarish. Scott's desperate performance gives Smile 2 an emotional intensity that just beats the original. 6 Hereditary (2018) Ari Aster's Hereditary scored 81 – a well-deserved reputation considering the movie is built on family tragedy, psychological deterioration, and occult horror. Toni Collette is absolutely extraordinary as Annie Graham, an artist whose family begins experiencing horrifying events following her mother's death. The infamous roadside decapitation sequence is one of modern horror's most memorable and upsetting moments. However, Aster's achievement lies in what happens afterward. Peter's reaction, the agonizing silence inside the family home, and Annie's eventual discovery of what happened create an atmosphere of unbearable grief. Hereditary uses its miniature-house imagery to suggest that the characters are trapped inside a carefully constructed nightmare. By the time its supernatural revelations arrive, the audience has already been subjected to considerable psychological punishment. 5 The Conjuring (2013) James Wan's The Conjuring scored 88, which seems fitting considering the sprawling franchise it quickly spawned. Inspired by the purported investigations of paranormal investigators Ed and Lorraine Warren, The Conjuring follows a family experiencing violent supernatural disturbances. Wan flaunts his legendary talent for suspense, notably during the hide-and-clap game. Carolyn Perron searches for her daughter in a darkened bedroom, only for an unseen presence to reveal itself through an unexpectedly loud clap. The moment when the disembodied hands appear from behind and clap next to Carolyn’s head is an absolute masterclass in horror movie misdirection, urging audiences to look in the wrong place entirely before a chilling jump scare. The Conjuring's frightening atmosphere also comes from its domestic setting. The farmhouse's corridors, basement and children's bedrooms become threatening, transforming familiar family surroundings into places where something horrible might be waiting. 4 Insidious (2010) Another James Wan production, Insidious scored 90. The combination of supernatural mythology and exceptionally effective jump scares proved particularly successful, starting yet another mighty horror franchise. Patrick Wilson and Rose Byrne play Josh and Renai Lambert, whose son Dalton falls into an unexplained coma and becomes the target of aggressive paranormal activity. Insidious's most memorable scare depicts a red-faced demon appearing behind Josh during an otherwise ordinary conversation. Its sudden appearance is startling precisely because Wan allows the scene to unfold naturally before delivering the shock. However, the Further's nightmarish landscapes and the suggestion that Dalton's consciousness has become trapped somewhere beyond the physical world give Insidious a more disturbing dimension. The supernatural mythology makes the possibility of losing a loved one considerably more frightening. 3 Skinamarink (2022) The experimental horror Skinamarink scored 91, despite abandoning almost everything audiences normally associate with horror stories. Rather than following a clearly defined narrative, Skinamarink places two young children inside a house where doors and windows mysteriously disappear, and their parents become increasingly absent. The frightening imagery is often deliberately difficult to distinguish. The camera lingers on dark hallways, ceilings, and seemingly insignificant household objects. Viewers are forced to search the frame for something that might not even be there. Skinamarink's 22% reduction in viewers' heart-rate variability was among the largest recorded by the study. It suggests that the oppressive atmosphere produces sustained stress – an apparent signifier of slow-burn fear and dread. Its approach might frustrate viewers expecting conventional scares, but Skinamarink is a wholly unsettling experience. 2 Host (2020) Host scored 95, narrowly missing the top position. However, it did produce the highest average heart rate of any movie in the study with 88 beats per minute, implying that its terror is more sustained throughout. Made during the COVID-19 lockdown, Host follows a group of friends participating in a remote séance over Zoom. The familiar video-call interface makes the supernatural disturbances particularly effective. Characters disappear from their screens, strange figures emerge in the backgrounds, and seemingly harmless technical interruptions become unfathomably sinister. One particularly frightening sequence involves a character investigating an unexplained noise inside her home, with the limited webcam perspective making it impossible to establish exactly what is happening outside the frame. At just over an hour, Host wastes remarkably little time delivering its scares. 1 Sinister (2012) Scott Derrickson's Sinister takes the top spot with an extraordinary Scare Score of 96, retaining its position for the fourth year in a row. Ethan Hawke stars as true-crime writer Ellison Oswalt, who discovers a collection of disturbing home movies while researching a series of family murders. This footage is easily the film's most frightening element. The grainy 8mm recordings depict seemingly ordinary family activities before revealing horrific acts of violence, including the infamous lawnmower scene. The contrast between the cheerful presentation of the recordings and their horrifying contents makes them particularly difficult to forget. The study recorded a 34% increase in viewers' average heart rates, alongside a 21% reduction in HRV. Clearly, Sinister is one horror movie that audiences haven't managed to shake off.