Here's one I forgot! Years ago I was housesitting (and catsitting) for my aunt and uncle. It was a modern, small house in the middle of nowhere and I treated it like a retreat. Weird things used to happen at night like radio alarms would switch themselves on, a VCR started playing automatically, the phone would ring but doing 1471 on it brought up no records of recent calls. I thought maybe it was a power fluctuation thing so at night I started turning off the power at the fuse box. But then doors started opening, including one where a utility closet had a carpet laid and the door was shaved so you really had to force it open and shut. I understand there are logical reasons behind all of these but even so it was really spooky as it constantly happened.