You're not as clever as you think you are

Scene: composition classroom. Draft workshop.

Student in the back of the room has finished her review (and has worked hard, no complaint there). She moves to the very back seat, ostensibly blocked from my view by another student, and begins texting furiously, but furtively.

I look straight at her and smirk. She tries the poker face. I'm not buying it, and we both know it.

Awesome.