Good for Halloween.

I read a thing on Boing Boing about two guys who built a 'haunted' room-- a room that included certain environmental factors that have been reported to exist in places where hauntings have also been occurred-- things like electromagnetic fields and infrasound (whatever that is).  I really liked this conclusion:

Overall, despite the results, Chris French and his team feel the experiment was worthwhile. Given that most participants did report unusual sensations they felt that "we can indeed claim some success in building a haunted room." Just the haunting didn't come from EMF or infrasound, but instead from suggestion and a quiet, round, dimly lit and featureless white room which "may have constituted a form of mild perceptual deprivation").