I used to work in a pub, morning shift. Many times throughout the day, different people/groups of people would hear footsteps walking behind the bar. So, imagine that the bar is in the middle, there's two separate areas either side, one for darts/TV on, the other with the pool table. There's a hallway behind the bar which is where the toilets were, between the two rooms.
One morning, I was sitting at one end, talking to a couple of friends. There was maybe four others in our side too. I noticed at the far end of the bar, in the pool table room, someone sitting, waiting to be served. When I went over to serve him, there was no one there. Clear as day, I can remember the way he was hunched over an empty pint glass (I don't remember the glass specifically but that was the position he was in.) when I went back, I mentioned it and everyone confirmed it was just us there.
He was a notorious ghost. He'd hide things and it'd would turn up months later in places it definitely wasn't. For example, the landlords mobile went missing. Sometimes we'd hear it ring but couldn't find it. One morning, it was ringing... From where the backs of the sofas met the seats. No chance it had been there all that time, as they were cleaned daily and obviously had patrons in. The phone just turned up there one morning before opening.
We lived above it and often would hear our names being called. When we were alone.
The cellar was the most creepiest place I've been in. Always felt watched from the shadows, but it's a massive dark cellar so I think that just goes with the territory 🤣