This is my first post on here so bear with me! I'm 20 years old and I live and work in London. I have had paranormal experiences in the past but they have never been in my own home. I have been working in my current job since July 2013 (a sales job in a publishing house in Clapham) and the first few months there I never experienced anything out of the ordinary until around November.
I was sitting at my desk doing some sort of admin work when I heard some sort of humming noise in my ear. It was like one long deep hum in the same note for about 5 seconds. What was weird about it was that it didn't feel like it came from anywhere- this part is hard to explain; I mean it didn't sound like it had come from any sort of direction but it also didn't sound like it was coming from somewhere right by my ear and it also wasn't a hum that came from inside my head. I don't know, its really hard to explain, but anyway it startled me and I spent the next 5 or so minutes in a complete state of confusion. After that I forgot about it and got back to what I was doing.
Another thing I want to add is that ever since I worked there (although I didn't ever take notice of this in the beginning) weird things were happening to me in the toilets. We have a single room for the toilet which consists of two cubicles- a boys and a girls, although no one takes notice of the signs and usually just goes into whatever cubicle is free at the time. Anyway whenever I'd use the boys cubicle I'd have problems with the door, the lock would always get stuck. One time it was so bad I had to text one of my colleagues (I always take my phone to the toilet for a quick twitter/text check) and ask them to come and help me out. As soon as they came in there the door unlocked fine. As far as I know none of them have ever had any problems with that door.
Then at the end of November/early December a new girl started who sits behind me. There is a mezzanine in the office which is used at lunchtime for people who want quiet and sometimes for meetings if the conference room is booked up. I sit with my back facing the mezzanine but the new girl that sits behind me, faces it. We were chatting one day and she said that she thought she saw a man up there but he would disappear when she looked back. She said this happened a couple of times. She never went into much detail about the way he looked or what he was wearing though.
There is a church opposite our work and me and my colleague (Emma) think that maybe our office was built over part of the church grounds in the olden days or something?
I just find this all weird as nothing ever happens in my home or anything like that but when I come in the office I get all this stuff like the humming in my ear and the toilet door! Does anyone know why this might be and if the stuff I have experienced is paranormal or down to me being paranoid?