Ok this is honestly 100% true and to this day I doubt myself but when I retrace it in my mind I honestly can't see how I imagined it.
At the time me and my (now ex but still friends with) partner were renting a rural property. Very rural, so rural that we were a good 3/4 miles from a village, 20 miles from a town. The house was surrounded by land and the land lord who has since moved to his other farm, kept livestock at on the land which meant we saw them most days while they tended cows/sheep/horses at the property. It was surrounded by bridleways and publish footpaths though these were very seldom used.
I was sitting at home alone while waiting for my partner to get back from work. Being in a rural area and helping with a house refurbishment meant some days he would work very late and other days he would come home very early if other work had postponed what he could do that day.
I was idly flicking through web pages and not really expecting him home. It was a sunny day and about 2pm in the afternoon.
I sat on the bed upstairs in our bedroom, the stairs were open plan to the lounge so I could hair downstairs very clearly. The house had a porch on the front so the front door, a porch used for boots/coats and a door into the lounge.
I heard the front door open. Initial thought was "oh OH is home from work" and I expected him to come up the stairs any second. Then a moment or 2 later after hearing some noises I heard somebody shout "hello??? he-hello?" as if lost and calling in hope of a person being there.
I immediately thought "Hikers", it was so rural people would often get lost from the footpaths and walks and I figured it was somebody looking for directions, as I threw on a slightly more appropriate pair of bottoms (I still had pj's on).
I heard the door to from the porch into the lounge open, it had a barn door latch that was very easy to identify.
As I pulled my jeans on I thought "hmm, perhaps it is somebody who knows Landlord and doesn't realise he has moved" and this was my reasoning for why they would open the door.
I started down the stairs and as I got to the bottom I saw the door open and said "hello??"
Totally silent. I looked around, through the porch and then went outside to see if anybody was around... Not a soul.
I told my other half when he returned home who said I was bonkers/probably imagined it.
2 months later I was out for the day with a friend. When I got back my other half sat on the sofa with no computer/tv on as white as a sheet. He told me both doors has opened and somebody was shouting "hello" but nobody was there.