The seniors in the high school I work in tin foiled the principal's office. And I mean the ENTIRE office. Pens, papers, books, pictures on walls, covered the walls, floor, ceiling, desk, windows, shelves, chair etc., etc. It was hilarious. They even lined the inside of his desk drawers and his basketball shoes. The office staff was giggling about it for days. Last year, they filled the vice principal's office with those little styrofoam packing peanuts. She has a window above her door and they filled it through the window. When she came to school in the morning and opened her door, peanuts spilled out into the main office for about three minutes straight. We all died laughing at that one. Another good one just after christmas this year was when they took hundreds of old trees and put them in the main hallway in front of the office. There was a huge sign that read 'welcome to the jungle'. The halls smelled like a forest for days afterward. PM me if you want more, I have seen some real doozies over the last few years.