Whats the best prank you've ever pulled?

All the teachers at school get donuts in the teachers lounge and students arent allowed to go In there but since my dad is a teacher I can and there uwere donuts left over and we took them and bought chocolate flavored xlax ( laxitive ) and we melted it in the microwave and dipped the donuts in it and ped them out to all the freshmen cles and then stole the toilet paper and paper towels and shop towels and ANYTHING that could possibly be wiped with and locked it in the car :) omg it was funny as hell :) what hace u guys done? Sorry for any messed up words im typing on my phone :)