My story is from 2008 and at the time I was working at a psychiatric ward. I had been there for over four years and at time I would sense something in particular parts of the hospital but never saw anything.
However the feeling of being watched as you entered corridors and passed doorways was always there, more so when departments were empty or during the evenings.
The incident occured when myself and a collegue were conducting routine room searches, the particular room we happened to be searching in had a feeling of negativity and we always found that patients that were housed in this room were shall we say more difficult and unsettled. Temporary staff also sensed a negative feel/energy from the room even when they knew nothing about the hospital.
I walked in the room with my colleague and jokingly said "lets trash this room!" exactly after I said this, a plastic jug that had been sitting on the window sill flew off violently and crashed against the adjacent wall. We both looked at each other and the look on her face was " did you see what I saw?" my collegue looked at me and said 'Dupey" which translates as 'ghost'. We conducted the search as quickly as we could without saying anything else to each other so that we could get out of there fast.
As you can imagine an incident like this needs to be kept quiet especially on a psychiatric ward, if word got out amongst patients then it could cause panic. Despite this I approached my then manager who laughed it off which made me feel a bit embarrassed for having spoken to him in the first place.
Many other staff have had experiences there from hearing knocking on doors to ultility rooms and sightings of a little boy in the corridors.