Serial Pranksters. Aka Either an individual or a group of individuals stage all sorts of pranks all over Hogwarts. They start out fun and good natured, but some turn malicious. Students start pointing fingers and are out against each other, all thinking they know who is to blame. There are even some who are copy cats and try to sneak their own pranks in there to blame it on the real perpetrators. Maybe it sparks everyone to start revenge pranking, some people even targeting specific groups of people.