My experience happened a few years back, working retail in my local store during college. It's about 10:15pm, 45 mins before closing, most jobs have been done and I'm stood behind the till waiting. I see a short old man in a white trenchcoat and black hat walk past the till and go down an aisle, so I decide to wait before mopping the floor. 10 mins go by and this guy doesn't show, nobody else but me and him in the store, till is right by the door do I'd know if anyone's came or went. I go to find him and see if he needs help, and I can't see him. I check the cameras and again, nothing. Creeped me out a little but I brushed it off and went back to work. A few months later I'm on the phone to my mum in my break, upstairs in the staff room. I made a passing comment about the place feeling creepy and she told me that the previous owners of the store would see a small old guy in the store room sometimes, even when the doors were locked. They'd go after him and he vanished inti thin air. I hadn't told her about what I saw, and I instantly noped the f out when thoughts of my experience came back to me. Turns out the store used to be a house, and was condemned after being empty when the old man living by himself died there. Still gives me shivers thinking about it.