We had quite a few weird things.
First- We had an e.coli virus scare. The water was tested positive in one of our 4 wells on camp and only the staff were told. We didn't tell the campers, but we had to drink bottled water for over a week in the dining hall. Some of the sinks were okay, but the well that was effected happened to give water to the dining hall, infirmary (where I lived in a back bedroom), showerhouse, and staffhouse. As a result, we couldn't even shower or use any of the water in that area until they bleached the whole system. Then we could shower but we came out smelling of bleach. We couldn't trust anything and all the staff were paranoid. It turned out the test had a faulty result though.

Also- there was one particular cabin that every session (with different kids) they always saw a ghost- a lady in white- asking to come into their cabin on a rainy night. It was kind of weird because different kids and counselors lived there every session so there's no good explanation.