[ChrisA]

ok here it is the best prank ever...

if you have a multiple level school you can do this. get yourself a cow (or maybe a couple cows). walk them up the stairs of the school. (note: cows will go up but dont like to go down).

now if ur up to it you can get youself some pigs and run them up the stairs.
(note: pigs have a very very lovely aroma about them and tend to make everything smell as good as a pigsty)