How to respond to an annoying student

[judy]

I have a new stalker student now. She got an well deserved F and her emails and excuses are just dumber than a sidewalk! Her last e-mail was about how she can't believe I failed her! I somehow am responsible for her not knowing enough to drop the course.

If she emails me again, I think I'll say "I don't know," no matter what her e-mail is about. I find that to be one of the all time best answers in the world.