Who hasn't done that? I mean its just so inevitable. Rules like: We always play dodge ball at the end of lunch instead of doing lessons. We are allowed to talk during mental maths exams (absolute hell) We are allowed to stay in during break. We can sit where ever we want. (i have used this one so many times) We can put music on in class. (They always fell for that) Thats the type of supply teachers my school used to contract. It just shows how good my school my school was. Never learnt anything but like hell it was fun! C'est la vie :)