In my previous life, before Joe came along and the blogging started, I was a teacher for 12 years. And, in that time, I came across my fair share of passive aggressive behaviour in the form of notes. These occasionally came from parents who were using a liberal lacing of sarcasm in response to requests or letters about their children. But, more often than not, they were from supply teachers leaving comments about my class at the end of a cover period – advising me on what I needed to do to improve my class. Needless to say, most of these raised an odd giggle as I had absolutely no…