The upstairs of where I live, doors open and close on their own, both room doors and the crawlspace doors. The crawlspace doors even have latches on them, and one time one of them slammed open so loud I heard it from another room and it about made me jump out of my skin. With the room doors, I just hear the click/latch sound of the door knob/bolt opening and closing.

I'm not really sure what to make of it, because if it's hallucinations, I've never had hallucinations so 'real' before or anywhere else, but of course I'd sound crazy if I chalked it up to a poltergeist or something. So I just remain mentally neutral on it. It has never caused any harm, so I figure oh well.