When breaking in to your school during the holidays, in order to steal, deface the headmasters office and generally add some excitement to another muggy summers day in a quiet market town - remember to cover your tracks.
Whatever you do, do not bury your swag of multi-coloured marker pens in the school ground under some leaves. Not underground - under a few fucking leaves.
I would also advise that you don't write your name all over the boxes in multi coloured felt-tip, in order to test them out.
When the stash was found, and the police were called, it was lucky they had Sherlock fucking Holmes on their team. It didn't take him long to figure out the culprit, and I was consigned to three days suspension, which let me catch up on some serious Let's Go Maths!.