This past summer while hosting at a state park in Florida there was a loud knock at my door at 2:00am. It was a very upset camper who said there was a "Séance" in process at the site next to him. He reported chanting, drums, incense, etc. I told him I would call the sheriff. The next morning I stopped by this site and the upset camper was sitting there drinking coffee and much happier. He said the loud campers were shut down about 10 minutes after he and I were talking so I guess the Deputy wasn't far away. The offending campers were all still asleep. They only had the site they were on for one night and right at checkout time they tried to stay another night and the park suggested they go somewhere else.
The only other thing that happened a couple of years before at the same park was a 9' alligator walking through my site one afternoon.