By Lee Siegelman, no less:
Top Five Lies Told by Teaching Fellows
5. Iím not going to grant any extensions.
4. Call me any time. Iím always available.
3. It doesnít matter what I think; write what you believe.
2. Think of the midterm as a diagnostic tool.
1. My other section is much better prepared than you guys.
Oh, and some students deserve that you hold a grudge against them.