You might be a seer. That is someone who can see into the physical and the spiritual world. Some people do have this special gift which is pretty amazing.
Apparently this exists not only in vision, but in hearing, smelling, touching etc. Some people (very few) might have some sort (but not necessarily all) extra sensory perception. Ie, some can see, some can hear, etc, spiritual manifestations (whatever you want to call them).
Unfortunately this requires you to believe in these people, because if you can't perceive it, obviously you don't have the "gift/curse".
Suppose this was in fact the truth, you in the other side of the fence, can always call them nuts or con artists, because you yourself can never perceive like they can.
If only there was some way to "measure", i think this is where all the paranormal science tries to achieve...
And "who you are gonna call?"