In 1987 I was around my girlfriends house. We were chatting in her bedroom, all quite innocent stuff. The house was empty and we had the door of the room shut. The house was I am guessing built in the late 40s early 50s and was a typical 3 up 2 down semidetached council house of its time. She had told me they thought the place might be haunted as her brother had seen an old man sitting in the lounge.
So we were sitting there minding our own business when out of nowhere came a hard thump on the door and a deep male voice was heard mumbling something we couldn’t make out. We jumped out of our skins and got up and opened the door but there was no one there. A search of the house revealed it was still empty and the front and back door was still locked. I went around there again numerous times afterwards and nothing ever happened again whilst I was there.