Okay, I feel better now *sigh*. What's the best line you've heard as a teacher?
I don't know where to start.

If this thread continues, I'll try to add some "toppers".
My best adult student, who was and still is one of my closest friends, was an outstanding teacher in the public school system—second and third grade.
After I taught her a lesson—she is only one of three people I have ever taught in my home—we used to offically open up "the lemonade stand". You may remember Lucy and the lemonade stand from Charlie Brown.
She has moved, so although we still talk, it's not the same.
I wish we had a forum or sub-forum here: "The Lemonade Stand". Only a teacher fully understands what another teacher goes through.
My favorite (UN-favorite):
"What else do you do?"
When I hear that, I have to bite my tongue.

Gary