Today's Halloween ghosts are often depicted as more fearsome and malevolent, and our customs and superstitions are scarier too. We avoid crossing paths with black cats, afraid that they might bring us bad luck. This idea has its roots in the Middle Ages, when many people believed that witches avoided detection by turning themselves into cats.
I am thinking of starting a free banner exchange for anyone with a paranormal website. If you think this is a good idea then let me know. If there is enough interest I'd start it up.