This is a true story, I pride myself on being logical and pretty skeptical, perhaps to a fault.
However, when I was a kid my family moved into a new house for us but an old house in reality. It was a really old Victorian style house and quite beautiful. When I was a kid I always felt odd in certain areas, namely the bathroom I would run away from there after pissing shitting, as I felt someone was always behind me, like someone was looking at me. My little brother had a couple of issues, deaf and had a minor global delay. His behaviour changed drastically when we lived there. He became mute almost, never talking almost like a retard depression. He claimed he could not sleep because he could feel someone breathing on him, or blowing on him at night. As the months wore on he became more withdrawn and said that he couldn't sleep often opting to sleep with my mom most nights. He said that "they" wouldn't bother him with others around. Now keep in mind he was globally delayed and lived in a fantasy world, played dinkies like it was his job so no one took him serious. We started noticing that he would pretend play as if someone else was there, often leaving his toys set up as if two people were participating, again I know it is probably normal, but quite odd as imaginative play is almost nill in these people, they can't imagine things. Anyway after a couple years he continued his decline, started having multiple unexplained marks on his body etc. He become somewhat violent and aggressive, a normal progression. however, one night he was bathing and seemed a bit, I don't know, scared, quiet and odd. Too much time had gone by and my mom checked the bath, and there was my brother dead, he drowned, in the bathroom I always felt unsafe in. No bath water on the floor, just laying flat on the bottom eyes open. Now he did have seizures because of his issues so that's possible, but that's when really weird shit occurred. I would hear giggling come from his room and his almost groan like ughhh he would do when happy. One night I heard an audible gurgle coming from his room. I went in the dinkies were set up for two, but no one had been there for a while. I then heard the same shit coming from his closet. I was too freaked out to check at first but it persisted.. I opened the door your moms a whore go do your chores.