It dawned on Fiorella the other day how much of our classic literature is what we now classify as paranormal. Think about Homer's epics--the appearances of the gods and goddesses in the Iliad, plus the bizarre creatures encountered in the Odyssey. Think about Grendel and the dragon in Beowulf. In fact, think about Beowulf himself, swimming around for--eight days was it?--fully armored. Think about Spenser's Fairie Queen.
Shakespeare was something of a realist, but in Midsummer Night's Dream, he too dipped into the paranormal.
Fiction lets the mind run wild, and apparently human minds tend toward the abnormal--uh, paranormal.