Unique and Creative Senior Prank

Well most people now-a-days know the old senior pranks like the pigs labeled 1, 2 , and 4.....well i'm looking for something fresh and unique. Creative. There are no limits as long as theres a way you can tell me how to get it done. That means no money limit no props limit, no people limit, as long as you can tell me what i need and how to do it. (Or at least a pretty good idea.)