hehe that's one of the better questions posted here:)
Being from the "non believer sect" on this subject I'd say only if you want it to be:) but I cannot comment on a specific address about anything.
Actually there was a court case years ago on something like this and it was determined that since hauntings and ghosts are not considered fact rumors or reputations of them do not have to be disclosed. A few agencies I have seen over the years have a disclosure line item asking this question but to me that's nuts. The courts ruled on the subject so its best for agents to stay out of it....unless answering on Trulia:)
My best argument against hauntings is that if "ghosts" haunt the places they die in wouldn't hospitals be extremely haunted? :)