What led the mean teachers to killing every single person in the school was revenge for their "original attack" on the school. That original attack was on May 20, 1999 when the mean teachers had first attacked the school (which at the time was called Englesby Junior High School). About 50 to 60 people were gruesomely murdered by the mean teachers that fateful day, but after hours of tragic moments, most of the mean teachers were gunned down by local cops and some F.B.I. agents on the scene. The rest of the mean teachers were chased out and took refuge back into the underground where the mean teachers lived. This odd but true story was featured on some of the local media, and was even mentioned on the TV show "Ripley's Believe It or Not".