*every* school in Australia does this. My (government) school muck-up day involved glad-wrpping every entrance to the school and toilet papering the local train station
Private schools do tend to have slightly crazier stunts though. Scotch, also in Melbourne, and original inventor of soggy biscuit, was responsible for the genesis of two of the most memorable and copied stunts-diverting highway traffic onto school grounds and locking thousands of cars in; and leading a cow to the upper floor of a building which necessitated the use of a crane to remove.
Sometimes, stunts go horribly worng, however. One school in the western suburbs, public I think, decided that a chicken massacre would be worthwhile; a private school in the bush burnt every tree in the school grounds, killing possums.
Is it acceptable? Not really. But it is an institution and it will never fade completely.
