Things People Do Behind Teachers' Back

The nice thing about career talks is that I get to see nice quotations posted along the walls of the high school. I'd like to quote a nice one I saw:

"The hardest job students have to face today is learning good manners without seeing any."

A very nice quote indeed.

I can't imagine what I saw in another classroom when I was proctoring a high school entrance exam. I saw a student lifting up a fire hydrant as if it was a dumbbell!

I'm wondering what students do behind my back when I teach. I have witnessed a student looking at his mirror while fixing his eyelashes. It's insulting for me, but that's life.