In my rival highschool the senior prank this year was to fill the A/C units with dead fish.
Bad idea.
VERY. Bad. Idea.
Bad idea.
VERY. Bad. Idea.

Also @Nightmare Bunny, I'm hyjacking your religion and turning it into the Tesla Creed. From now on the Echlesiarchy checks the faith, not some random preachers!
You, my friend, are the arteeest.
(Jk, Urban, you know we love you~!!)