I was talking to some guys today who went to a really posh school near my hometown...and dear god, the pranks:
-repainting one of the (small) school buildings totally bright pink
-moving all the staff room outside and recreating it, and putting turf all over the staff room floor
-moving the entire cricket equipment, plus boards, into a small grassy area inside the school building.
-buying a sheep, and letting into the staff room.
jeez, all we ever did was put laxatives in the staff room kettle....TAME.
best pranks then?