There is nothing paranormal in our universe. Almost
every single phenomenon that you might call paranormal or unexplainable can be explained with science or the delusion/insanity of the individual who spotted it. Only because some things of reportedly supernatural matter can't be explained with physics or current observation techniques doesn't mean there are ghosts hunting houses. It means that the human mind is extremely susceptible to hallucination, especially when one is left alone in the dark in a allegedly haunted house.