One of the things I love most about being a substitute teacher is the complete unpredictability of the job. When I step foot into a school in the morning, I have absolutely no idea where I’ll end up. Oh, the dispatch callers who give you the assignments will tell you which department a particular teacher is assigned to, but that often doesn’t mean anything. I could get a call to be in for an English teacher and end up teaching computers, or a call for special education, and end up teaching science. Today was one such example. On Friday night I went out for dinner with a couple of my…