The actual story is that a couple of guys broke into a cleaning locker that was in the bathroom (school was old had weird set up) wherein some of the dumber smart guys decided to mix ammonia and bleach in a toilet. Funny enough I was the source of that problem and also how it was noticed because I spread the knowledge of that particular bit of chemistry, and was laughing my ass off at the fact that the toilet was at that point actively hazard due to mustard gas.