We all got smashed then we took the school "hostage" (Ahhh the good ol days before terrorism
), we all dressed up in camo gear and balaclavas with supersoakers, waited till 9.10 and rushed the principal's, deputy principal office and staff room using the school P.A. to call all students to an assembley and before they were freed they were made to do something embarrassing/funny in front of the whole school to earn their freedom. We had one teacher try to "escape" who was hunted down and soaked. While this was happening we had a "covert" team setting up traps around the school, fire extinguishers (our own) rigged to trip wires, stacking the inside of class room doors with desks and chairs and then escape through the windows, Moving the teachers cars, fart bombs inside the cushion of the teachers chair, "stole" the school bell, filled the year coordinators office with basketballs/tennis balls, things like that. Was all pretty tame but it was good fun