Something you might wipe clean metaphorically, usually made of stone

Put it in the door, to try and get ahead; put it in your mouth, and regret what you said. It helps you stand, it helps you move, when you're dancing, it helps you groove. Watch where you step, don't put yours on mine, or a stubbed toe will end your line.

I have thorns, but I'm not a rose I thrive in arid deserts Think of me as an organic pincushion

What’s black and white and read all over?

Why was the broom late to class? It . . .