Don't forge parents signatures on school documents for several years and get caught Don't tell your parents that parents evening at school is cancelled, send a fake letter home pretending to be the school saying it's cancelled, then have school ring home the next day asking why they weren't at parents evening Don't "modify" half term grade sheets Don't start an uncyclopedia page about your school, get everyone in the year to add stuff to it then have the school try and sue you for slander Don't tell teachers that they must have lost your work as you definatley handed it in, it doesn't work when you do it for every teacher and they all go and tell your form tutor Lol there's loads more, can't think of them atm.