Magic/the occult/the esoteric. Being able to influence people or events through the use of rituals or some other instrument. Do you believe in it?
I personally used to when I was younger. But now I feel superstitious and immature to believe in any such thing. Yet a part of me still wants to believe it. And a part of me definitely still believes in unseen things we haven't explained yet. I'm just not as quick to define them or believe in theoretical explanations of them.