1998 Sydney Boys was pretty bad.
"The first incident this year involved transferring a set of goal posts from Centennial Park to the school grounds, in fact the grounds of SGHS." [not so bad]
"Another incident involved entering the courtyard outside school hours and inflicting minor vandalism on items of school property. A wheelbarrow and valuable implements were missing. Only after dire warnings were issued were these things returned." [once again, nothing that makes it worthy of being pretty bad]
"A third matter involved vandalism to a bench seat near the canteen." [more annoying to the school]
"Certain members of Year 12 chose to purchase a 3' shark from an aquarium and to put it in the school trailer near the canteen, with a minimal cover of water." [wtf, I didn't know you could just buy a shark]
"On Wednesday morning boys from SBHS and girls from SGHS were egged at Central Station. " [normal, I guess]
"The Principal of SGHS reported to me that a girl from SGHS was struck near the eye by an egg thrown by one of our boys." [yeah, not cool]
"Another girl had a large bruise on her leg caused by a water-filled balloon."
"A group of perhaps 20 threw water on junior students at the Girls School and, according to the Principal, caused them considerable distress. It was only because we set up a perimeter and kept the boys off school premises that more such incidents did not occur. The boys had both eggs and water filled balloons on them. They planned to use them. Some boys did chance the perimeter and ran through the Girls School throwing objects. One group that attempted to enter SGHS were directed not to by a senior woman member of staff. One of our group, according to a written statement by her, said 'very loudly' : Who the f*** cares?"
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http://year12.com/sydneyboys98/yr12cancel.htm
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I dunno, seems quite insane. Our muck up days tended to be a lot more tame after that. I've always held that muck up days should only involve those who want to be involved. So that usually means waterfights and egging each other (Yr 12s), and not unsuspecting juniors.