This story is perhaps not the most exciting but still puzzles me to this day. It happened around 14 years ago. I used to work for a very well known shop in the UK - which sells stationary, books, newspapers and magazines, etc.
My job (basically) was to take all the newspapers and magazines that had been delivered and put them on the shelves ready to be sold.
The shop was in an old four storey building. What I assume was the cellar is where the stock room was. This is where all the deliveries were dropped off as well. The ground floor was the shop itself and the 1st and 2nd floors where the offices. To get to the 1st and 2nd floors you had to use the stairs - each floor had fire doors at the entrance to them.
I had a key to let myself in, and I would immediately lock the door behind me. I started work two hours before anyone else, because all the newspapers and magazines had to be on the shelves before the shop opened. So for two hours I was completely on my own in the building.
The deliveries were in the stock room so that's were I was this particular morning, lifting bundles and bundles of newspapers and boxes upon boxes of magazines onto cages to take up to the shop floor (via the lift which only went between the stock room and the shop floor). Anyway, as I'm in the stock room and, knowing I'm the only person in the building, I hear the fire doors upstairs banging! I still to this day have no explanation as to how fire doors can open and close on their own, or how I managed to put my fear to one side and get on with my job, instead of just legging it out the door.
Afterwards, some of my colleagues told me that an old lady had died in a fire there a good few years before it became the shop we worked in.