Ok, I wasn't going to share this one because a lot of people who know me will identify it and also because it sounds insane but I promise it is true.
When I was 18 I was lucky enough to rent a manor house with a little annex on the back. The house was boarded up except for the bit where we lived. at the back, there was an internal door into the main house.
Because of the fact it was a high value property that was in need of repairs and had been a target for break ins I was lucky enough to pay "peppercorn rent" in exchange for watching the property.
I lived there with a friend and my then partner and my 2 dogs.
I was sitting in my housemates room on the bed together and we both watched a white smoke like object glide across the room, and then ball up at the window. We looked a little confused and then we realised that the other had seen it as well and it hadn't just been in our heads.
In my room there was a large double bed, and often, at night... a man would be seen standing at the bottom of my bed with his arms folded. He would just stare, it was very dark there (no street lights closeby) but you could clearly see his form at the bottom of the bed. Me and my partner both saw him.
My partner also often tried to stroke dogs that were not there if it was dark, once he said "Hey lil dogsname" and I said... "Erm the dog is over here".
My mum would visit pretty often and her partner once saw the ghost dog.
The man at the bottom of the bed appeared to wear a uniform, like a war uniform. We heard banging from inside the main house, against the internal door. Nobody slept that night.
We went into the main house, following a break in. The house had remained untouched for years and years, huge bedrooms with peeling wallpaper and piles of stuff. I was strangely drawn to a box on top of a wardrobe. I opened it to find a medics uniform from the war (the same uniform that the man wore). It also had a photo of him in the box and a photo of 2 dogs that had "alpha and beta" written on the back.
I went to the graveyard the next day and found the mans grave and as was traditional for large families who had their own plots, alpha and beta also had a grave stone there.
I asked my landlady about this man, and it was her grandad. He had died in bed in the room I had been sleeping in some years before.