push all the cars onto the sports fields, get three sheep or general animals; paint numbers 1,2 and 4 on and let them loose in the school, guaranteed the teachers will run around looking for number 3.
It depends how destructive you want to be...
Expanding builders foam in car locks or down the sills of the windows - rips the door apart
Only enter/leave rooms via windows
Lock the car-park closed (I did that to the PM of new zealand and the stupid woman spent 20 minutes driving round in circles)
Balloons on exhaust pipes of cars
Capture pigeons/seagulls and release in corridors/class rooms/hall
"Police Line" Tape can be procured relatively cheaply from eBay - run riot
I'll post more when my twisted little mind thinks them up
Apparently at a school my old teacher was at students managed to get hold of 6 sheep and numbered them 1,2,3,4,5,7 and set them loose around the school. Teachers spend ages looking for 6
At the very minimum, you'd have armed police and bomb disposal experts. To up the tension, say that if anyone leave the school, you will detonate anyway
Get a few of you and hide one of the teachers cars by picking it up. Some people around here got one of the teachers Mini's and dumped it in a dried up river!
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