Shortly after my wife and I were married, I got reassigned to Mather Air Force Base in Rancho Cordova, California (the base has since closed and is now used by the local community). We rented an upstairs apartment in a complex close to the base and was a decent place to rent and live life with little to no spending cash. We wanted the upstairs due to the security of being inaccessible through a ground level window or having the front door so easily gotten to. So we felt very secure there.
We had two cats as our 'children,' Opie and Boomer. Both were extremely hyper cats and had to be closed in one of the bedrooms to keep them from destroying the apartment while we were gone.
The doors in the apartment were all slightly warped to where a person would have to push or pull the door in at the middle for the latch to fully engage in the frame's latch hole.
One evening my wife and I went out to eat. Prior to leaving, we put up our kitties in their room, pushing the door in the middle, as always, to fully engage the latch. Upon returning, we were talking, meandering around, petting the kitties... Petting the kitties!
As soon as we realized the cats were out, my wife pushed her chair up against the wall and whispered loudly, "The cats are out, check the rooms!"
I went throughout the place, nothing. When I checked the door, the door was closed fully, just like we leave the doors when we close them.
There was no explanation other than the cats just happened to be on the other side of the door. We left it at that.
There would be other events in the same apartment that would prove the apartment had bad spirits, tricksters. This was just the first of several incidents that convinced us that the place was occupied by others that didn't pay rent, spiritual free loaders!