Comment Infrasound: One possible explanation of hauntings (Score 1) 810
I read this article recently which mentions one explanation for "hauntings":
http://www.cracked.com/article_18828_the-creepy-scientific-explanation-behind-ghost-sightings.html
So, one thing to check for would be infrasound. If you find it and can identify the source, you may be able to put a stop to the "hauntings".