A couple weeks ago, I received a call asking me to teach an extra class this semester (Fall 2013). This was the result of a last minute change out of my control that required an extra instructor to come in on the class. I decided to say “yes” because I have taught the course before, and I was probably the most natural fit to fill in at the last minute. Unfortunately, this caused my other class to have to change lecture time, and subsequently caused a whole bunch of scheduling issues with many students in the class who were taking classes at the same time.