Everyone is afraid of something, and some people are afraid of everything.
While there's a fine line between fears and phobias, there seems to technical distinctions for almost every type of fear. In fact, there's even a term for people who are afraid of being afraid. It's called Phobophobia.
However, some fears are more common than others and seemingly obscure fears tend to set themselves apart. While you can't blame a person for being afraid of skydiving, you may not find to many people who are altogether afraid of gravity.
We've put some of our favorites below, but you can always check out phobialist.com, which contains more scientific names for fears than you ever imagined actually existed.