I just want to say that over the years of teaching and especially since becoming a mother, I have perfected the evil stare which lets people know a variety of things. Here are some things they might glean from my stares:
"What are you doing?"
"I'm watching you."
"Better be quiet."
"Excuse me, I'm talking now."
"And, what exactly do you think you are doing now?"
"That really su-u-u-ucked."
"I knew you weren't listening."
"Yes, I called on you because you were sleeping."
"See me after class."
"I have absolutely no idea what you just said."
Okay, this is getting to be too fun. Back to work.