While it's been said humans have nothing to fear but fear itself, it turns out there are a lot of things in our DNA that dictate what we fear. Why are certain things scary? Some things are scary because they bring us back to negative memories, while others are scary because of the physical response they illicit in our bodies. And while some phobias are downright weird, there are lots of things that are instinctively scary to humans, and for good reason. Fear is a pivotal component to everyday survival, engrained in us from our long lost ancestors. Some of these fears turn to full-blown phobias.
But there's no denying there are universally scary things in nature. Some scientists have suggested fears are passed down through DNA, meaning there are certain things we are born to fear.