A Scare Before Worktime

I work in a cinema in Belfast Northern Ireland and this is my first entry, this account is 100% true

And I'm happy to answer any questions as well as listen to a few theories

I was coming into work for my morning cleaning shift, every night the supervisor sets the alarm so every morning when I come in I set it off and have to silence it with my own code,

This particular morning I came in the lights were out as usual. I went for the door but the alarm never went off. I found this strange but I continued turning on the lights. When I was finished opening the office area, I left the cinema and ran across the shopping mall to get a coffee. When I came back I realised that the light was out. I opened the door and the alarm went off almost giving me a heart attack. I keyed in my code and began trying to work out what happened. I was the only one in that day until 6pm and no one else had access to the office area. I also talked to staff later that night and no one was in that day I may have missed

1 year later and I am now a supervisor in the cinema.

about a week ago I was chatting to the security guards who told me that before this site was a shopping mall it was a lucozade factory and one of the guards back then was shot dead, also they say that I was not the only one who has had an unexplained experience in the mall apparently a pound stretchers worker stocked up their shelves for Christmas one year only to come in the next morning to find all the bottom shelf items neatly rowed on the floor.

I hope you enjoyed my experience, has anyone experienced anything similar?