"I googled what is rated the number one scariest movie ever made. So actually I found a scientific study that also answers this question where subjects were strapped to a heart rate monitor, and these are the top five that got their heart beating the fastest. Number five is "Paranormal activity" with the average heart rate of 82 beats per minute. Number four is "Hereditary" with 83 beats per minute. The number three is "the Conjuring" with 84. The runner up the scariest movie is "Insidious" with the average of 85 beats per minute. And the number one scariest movie according to science is "Sinister" with an average of 86 beats per minute. And as a bonus, the winner of the biggest jumpscare was "Insidious" and it got people's heart rate up to 133 beats per minute."