My sister just finished a teaching program last month. Part of the program required her to do a community field project (I forget the actual term for it, but it's something like that) but it's basically teaching somewhere that's not a school. My sister was placed at a museum and one of the things that she was told on her first day was that the museum was haunted. Kinda plausible since this museum was located in a historic area and the focus of the museum was basically what life was like for the first settlers in the area so there's a lot of personal stuff like clothing, jewellery, books, etc.
Anyways, so my sister was in the basement of the museum. Can't remember what she said she was doing there but she had some of her stuff sitting on a chair at the other side of the room while she was doing other stuff. Then just out of nowhere her water bottle fell off the chair.
That maybe doesn't sound too weird, but she had a Swell water bottle. You know, one of these big metal things?
So it's not like it's not like it could have been knocked down by a gust of wind. She was also alone at the time. I'm not always one to just automatically assume that it was a ghost, but that was definitely a ghost.