A childhood belief about fear of

My principal at our Elementary School used to say to us not to play around in the bathroom, so of course that made us play around more like this one girl showed her buttcrack and I think I janitor was in there and she reported the incident to the principal so the next day he announced he had just installed camera's in the bathrooms and he made a special request to someone not to show their buttcrack again and so everyday the girl would come in the restroom with a very small umbrella and sit it over her stall, do her buisness and come out. Very stupid. We all thought he was watching us from the camera so we would all bring umbrellas from then on until he announced he has had complaints from parents about the camera thing so he said there never were any but we were still afraid there were so we still carried umbrella's just in case.