I personally am skeptical of the paranormal. I do however thouroughly believe that people can "hear" things or "see" things akin to a spirit, but one must remember how hyperactive the human brain is. It's firing so often that it will sometimes think it hears or sees something. If you're told that something like a ghost exsists then you might possibly believe that it is there and could possibly see it. I've had incidents were I hear my father say "hello" while he's away and just realize its a trick of the brain (and I was in second grade). I've also thought while camping that a monster from a story i heard tore open my tent, but it was really my friend stretching and rubbing on the material. But one may never know, the universe is a strange and massive place...
