This reminds me of something that happened to my best friend 30 years ago. We were in the Marine Corps and decided to go swimming on our day off. While we were in the locker room my friend decided to go to the bathroom. After we had changed we headed to the pool. I noticed that he kept rubbing his butt and I asked him what he was doing. He said that his butt itched. I told him to leave it alone and get in the pool. We both dove in and he started screaming and got out almost as fast as he got in. It seems that some wise guy had doctored the tolet paper with itching powder and the walk out combined with his rubbing had just about rubbed him raw. When the clorine hit he was a sore puppy for a couple of days. I laughed until I hurt.