Turns out that, regardless of how fearless you think you might be, there is one fear that literally every human has - and you've probably never heard of it. An effect called "Approach Aversion" is an involuntary fear response to any object that appears to come closer towards you. In evolutionary terms, this actually makes a lot of sense. Generally speaking, in the animal kingdom, if something is moving towards you, it's probably not about to give you a cuddle. However, this response isn't just brought on by charging bulls and sabre-toothed tigers, as virtually anything coming at you will elicit it. This includes cars, random people on the street, text on a screen and your dear old grandmother. It is also the reason why upcoming events, even ones that you're actually looking forwards to, will occasionally cause an inexplicable twinge of dread. Don't worry, you don't really hate your friends, you brain is just worried that they might try to disembowel you. Now that we live in a nice, tigerless world, we can manipulate this instinct to purposefully scare the sh*t out of ourselves. We find 3D films thrilling, and everybody knows that the best way to squeeze a jump-scare out of an audience is to have something rush towards the camera.