Ooh, I had a fun experience last week. I work for the Trust in Melbourne and was working at this site, overseeing photography students and their models: https://www.nationaltrust.org.au/places/labassa/
Labassa is a gorgeous old place, very atmospheric, dark and a bit gloomy. Being on your own there, I always have the feeling I'm being watched and that someone (many someones?) are just watching to make sure I don't do anything I'm not supposed to. When there are a lot of people around, that feeling dissipates, and this was a big group of 20 students and about 15 models so lots of people.
Anyway Labassa has always been something of an artist's haunt. For several decades it was split into apartments that were mostly home to painters, sculptors, writers, etc, so I thought the house would probably enjoy having the photographers being very artistic (people wearing draped fabric down the stairs and tied up in ropes and all sorts of things).
I was sitting at a small table near the front door. The table had a glass top (one of the round small outdoor ones) and I was working on a laptop with my keys on the table next to me. I was watching a photographer set up the shot, thinking how much the house might have looked like this in the 1960s, when I heard a clink. I looked down and saw my keys move.
Then they jumped off the table (I actually saw them lift!) and landed on the floor.
One of the photographers looked round and saw them on the floor and laughed that "the ghosts must have done it".
I certainly hope they enjoyed the show anyway.