I was in the office late tonight. Alone, everyone had gone home, working on my computer and something caught my eye. I swear several desks away someone walked quickly past! At the same time a computer screen in that area suddenly turned on, like it would when you move the mouse to wake it up. I went over and sure enough nobody there. Didn't hear any sound, just saw something move some movement. Nowhere someone might have hidden. Walked around the whole floor. No one around. Completely spooked myself out. Still getting a bit of a chill thinking about it.

Not helping myself to remember that my office building is on on the site of a former hotel.

Not that I'm a huge believer in ghosts but obviously enough of one to feel creeped out by this!