Senior Prank help/Animal Control?

Okay here is the thing me and my friends are not retarded so we want to pull a senior prank that will be memorable but there are a couple rules
1. no one can get hurt
2. no damages
3. not illegal in anyway
we have the perfect prank literally epic we were just wondering if we do pull this prank that fallows the rules nothing illegal, no injuries, no damages and then we come clean say it was us like the day it happens would we get into a lot of trouble or will they still let us walk and go to grad night the year before here is what they did

2 years ago
the seniors stole the janitors gold cart and buried it literally to the roof in the quad and well they were charged with breaking and entering and stealing and the cart was destroyed so obviously retarded

last year
the tipped the trees and threw forks in them the administrators did not care and no one got in trouble it was a stupid prank

if there are no damages and and no injuries and not illegal will they take away grad nigh and walking across the stage????

By the way do schools use the city animal control or do they use a private organization?

They might take it away it depends on the strictness of the school. If they have a sense of humor and it follows the rules then it can go smoothly. If the school is strict and serious then your probablly going to get it taken away.