Screw waiting till Senior Year... my year's always working on pranks. Our school is very strict and none of the teachers have a sense of humour regarding pranks.
My favourites : When we put a CD of the Imperial March on repeat over the PA. We then foamed up the lock behind us, and proceeded to the next stage. After an unsuccessful day of trying to turn off the PA or get into the room, none of the staff noticed the entire second year dressing up, at a cost of about £2000, in rented stormtrooper costumes. In perfect unison, we marched solemnly through the school, lunch hall, and down the big street behind our school, all to the Imperial March. Every twenty troopers had an officer, and we had intended to have a Darth Vader and Emporer, but we ran out of money.
We put bits of paper in the magnets that keep the doors shut, and at night my friends and I crept back in, and stole every door in the main building, and then nailed them over the main entrances to the various buildings. Nobody had any lessons for most of that day.
Another good one was a month ago, when we put trees in front of every security camera, and filled various classrooms and offices with shrubs and small trees, and our Rector's office was specially done up as a jungle, we even went to the trouble of shifting turf onto the floor, and put an inflatable gorilla in his chair.
Another expensive prank... we have our main building, with a few other buildings scattered around it down a street. In front of the main building is a massive, rather bare, granite playground/parade ground for the cadets/place where we assemble for fires and hold special ceremonies. We bought 3200 tires, and took a hundred from various teacher's cars, and we put them as a maze, five foot high, that didn't fill the playground, but surrounded the main building, and you couldn't see the entrances from the inside, as we made the wall higher nearer the building. The thing was, we didn't want to block off the doors, as that would be dull. We just wanted this very complex maze to get in the way. You could actually get in, it was just difficult. We had a map for when we built it, and we eventually gave that to the poor staff, and told them we had mapped out the maze ourselves. Proclaimed as heroes, we were exempt from cleaning it up later that day. It took four days, as they had nowhere to put the tires, and people kept getting lost while moving tires.
My favourites : When we put a CD of the Imperial March on repeat over the PA. We then foamed up the lock behind us, and proceeded to the next stage. After an unsuccessful day of trying to turn off the PA or get into the room, none of the staff noticed the entire second year dressing up, at a cost of about £2000, in rented stormtrooper costumes. In perfect unison, we marched solemnly through the school, lunch hall, and down the big street behind our school, all to the Imperial March. Every twenty troopers had an officer, and we had intended to have a Darth Vader and Emporer, but we ran out of money.
We put bits of paper in the magnets that keep the doors shut, and at night my friends and I crept back in, and stole every door in the main building, and then nailed them over the main entrances to the various buildings. Nobody had any lessons for most of that day.
Another good one was a month ago, when we put trees in front of every security camera, and filled various classrooms and offices with shrubs and small trees, and our Rector's office was specially done up as a jungle, we even went to the trouble of shifting turf onto the floor, and put an inflatable gorilla in his chair.
Another expensive prank... we have our main building, with a few other buildings scattered around it down a street. In front of the main building is a massive, rather bare, granite playground/parade ground for the cadets/place where we assemble for fires and hold special ceremonies. We bought 3200 tires, and took a hundred from various teacher's cars, and we put them as a maze, five foot high, that didn't fill the playground, but surrounded the main building, and you couldn't see the entrances from the inside, as we made the wall higher nearer the building. The thing was, we didn't want to block off the doors, as that would be dull. We just wanted this very complex maze to get in the way. You could actually get in, it was just difficult. We had a map for when we built it, and we eventually gave that to the poor staff, and told them we had mapped out the maze ourselves. Proclaimed as heroes, we were exempt from cleaning it up later that day. It took four days, as they had nowhere to put the tires, and people kept getting lost while moving tires.
I went to a grammar school and hated it. Thing is, we couldn't exactly do anything too rebellious, because these guys liked to call the police for so much as leaving your car somewhere it didn't need to be. I'd literally done the most rebellious thing in the school's history by firstly trying to hijack the school tractor and drive it round spraying people with a water pistol and generally looking badass, but failed because the security pulled me off after a few metres. On the day of leaver's assembly, I put a smoke grenade through the front door of staff house, and surpise surprise, they called the police and threatened to sue for burn damages and smoke damage... they never followed through, but I'm pretty much banned from school grounds 
