I think “people living in my house without me knowing” stories are the ones that scare me the most D:!
I used to get freaked out by them. Then I realized that 99% of the places I’ve lived in haven’t had an attic. with an entrance anywhere. Except for the dorms I was in last summer. Those had connected attics, so you can get from one dorm to another without leaving. Would be handy in a zombie apocalypse. Or at least that’s what I put in the zombie survival guide for my old University.