TerminalDegree, one of my favorite blogs, has two letters from the instructor to the class.
One is to the students in her class about not taking notes and the other is to the freshmen plagiarist who refuses to meet with the professor after several requests from the instructor to do so.
It's great insight to how professors think.
My favorite line:
To the students who e-mailed this week to tell me how much you are enjoying the class, and to the student who walked up and gave me a hug (even though I don't like hugs, I appreciated the gesture), and to the student who whistled when I walked on stage in the auditorium, thanks. I needed that.
Check it out.