Replying to Tame but awesome grad prank

this thread will suck.

this is because no one will adhere closely to what im about to say are our limits, but w.e., i don't mind hearing awesome/ funny suggestions even if we can't use them.


so, my school (shitty as hell private school) has had terrible grad pranks. then, 6 years ago, this one really messed up kid took cats that we dissect at the end of the year and tied them to our fieldgoal posts. parents and little kids saw, it was a big problem. the school almost got huge time sued because they didnt dispose of them properly (just chucked them in a dumpster)


so, now, if any grade doesnt get their ENTIRE grad prank approved by the principals, our prom will be cancelled. yes, i am aware of how stupid this is.

if anyone has any suggestions that won't harm people, won't harm the school and won't make a mess, id love to hear them. so far our only good ones are like filling up the main hallway with thousands of balloons during the night.



SPARKNOTES:
our school will cancel our prom if we don't clear our grad prank with them first. suggest pranks that are not hazardous to anyone/not too messy/ can't get the school sued.


thanks for any help.