You get: An e-mail with the subject line, "Last minute course materials for fall."
You think: Crap, something more I have to get/read for class.
You read it and find: A message from a book company rep, addressed to you as "Professor."
Also, it's weird how reluctant you can be to open your mouth in class when you're used to being the one who evaluates what people say, not being (explicitly) evaluated yourself. Okay, we've only had three classes - I'll get used to it. But right now it's weird.