What was your senior prank?

Between myself and four friends, we managed to release 800 crickets throught out the school. So the last week of school all you could hear in every class room was the sound of crickets chirping.
We had a better idea but most people were afraid to do it. At graduation every student was supposed to palm a small marble. And when you shake the principal after you got your diploma you transfer the marble to his hand. It would have been great to have him at the end of graduation with 300 marbles in every pocket he had.

Me and several (8?) other senior football players, the night before graduation, put the school headmaster’s Volkswagen bug up on cement blocks so that it was about 4′ up in the air.

Must be a WI thing because we had the greased pig dumped in the hallway on the last day for seniors. The pig spent too long in a barrel and the grease fumes had it semi comatose. The vice principal (former NFL lineman for Rams) grabbed it by an ear and leg and dragged it out. Also during outdoor graduation ceremony had Alice Cooper blasting “Schools Out” from the tower. Just had my 35th reunion this summer.