From most to least destructive
A boy in my class at school, who was generally thought to belong to the 'attending private school thanks to Daddy's wallet rather than son's intellect' club, approached me one day with his plans for the weekend. He and his henchmates had discovered a van hidden in some bushes near where he lived; it was very old and dirty, and looked abandoned. Their plan was to pimp this van and improve its ventilation system, by removing its windscreen and windows, and by adding aerodynamic dents to the bodywork wherever they thought appropriate. They asked me if I'd like to join them. Had they had a slightly more solid reputation at school rather than being famous for never doing any work in or out of the classroom I might have assumed they'd researched their story, but I decided to give them a wide berth. Came to school on the following Monday to find out that the van was not, in fact, abandoned and that the owner had surprised them bashing the shite out of it and causing several thousand pounds' worth of damage.

University shenanigans:

A group of about five of us decided to swap all the light bulbs on the girls' floor of the dorms for red ones, thus giving their living quarters an alluring 'Soho clip-joint' look. They saw the funny side. Some of them.

One vague acquaintance of mine came home from an evening of bucket cocktails (any of the innumberable 'drinks evenings' organised by student societies where cocktails were literally mixed in buckets) in an advanced state of alcohell and decided to pop in on his sleeping mate and wake him up by spraying him with the carbon dioxide fire extinguisher. Result: the entire block had to be aired the following day, the acquaintance came within a hair (of the dog)'s breadth of being sent down, and the mate was taken to hospital and told "If we'd found you 30 seconds later you would have been dead."

Finally, and just to set the tone, someone had written in the gents' of the King's Arms: "Talbot-Ponsonby has an arse like a wind-sock."
( .Yeti., Thu 7 Oct 2010, 18:03, 1 reply)

Cambridge?

(justin7926, Fri 8 Oct 2010, 2:31, closed)

Nope, t'other one ;-)

( .Yeti., Fri 8 Oct 2010, 13:38, closed)