I have discovered that a section of my floor along the north wall is surprisingly cold. Measurements with a thermometer indicate a temperature that's close to freezing. At this point, many superstitious people would jump to the conclusion that my room was haunted, perhaps by that Walter Gilman fellow who got brutally murdered back in the thirties.
A bit of detective work turned up that the person in the apartment north of me on the floor underneath has an extremely powerful cooling system that he constantly has running. Who knows? Maybe he's just an extreme overclocker. In any case, a perfectly natural source of the cold, and no need to drag the occult and superstitions into the mess.