Worried your house might be haunted? Not sure how to tell? If movies have taught me anything, just wait a while and, believe me, you'll know. Especially when the walls start dripping blood and your roommate starts speaking in tongues. (Then, you know who to call.) Joking aside, how can you tell if your house truly is haunted as some believe they can be, or if it just has an annoying tendency to creak like someone's coming up the stairs? Yesterday we told you how to haunt your house. Today, we offer a crash course in de-hauntifying it.