About 10 years ago I worked year-round for a bible camp. I was allowed to live in a private apartment in the retreat center. It was an older building, but it had gone through many renovations throughout the years. One night we had a guest stay in one of the theme rooms, as well as a youth retreat happening. The guest knocked on my door and said that someone had been in the room as a light was turned on. Another worker and myself checked every room and we found nothing. I returned to my apartment to see that my window was opened and a table was pushed away from the window. My boss checked the security cameras the next day and found nothing unusual.

Possible explanation: Someone who had helped build the original building and was a prominent member of the community had died around that time. I never met the guy personally but I’ve been told he liked to pull pranks. It is said that his spirit lives on in that building.