I used to think a house that I lived in as a kid was haunted. The time we lived there was a very turbulent one for my family--a lot of conflict and drama , strange incidents including some weird religious ones (Catholic family and some of my mom's friends were really fanatical Catholics), house breakings, etc. We've had priests come over to give the house blessings and hold masses to protect the house, that kinda stuff.
There was this one spooky night in particular. I was probably like 6 or 7 and woke up in the morning terrified from some nightmares I was having. They weren't like regular nightmares because I was too scared to go to the bathroom to get ready for school. When I eventually went to go bathe I began hearing voices in the bathroom. My two older sisters revealed how they had matching nightmares that night

And my eldest sister used to see ghosts in her room that she could talk to and she has other stories--she is a very dramatic person though, so I don't know.
Anyway, we were all very happy to leave that place despite it being the nicest house we've lived in. Looking back, it probably was our childhood imaginations but a lot of bad stuff coincided with the period that we lived there.