From Moonlight:

JUAN: Alright, first things first. You can’t sit at my table like that. You can’t sit with your back to the door. C’mon. [Juan slides Little’s chair around the table.] How you gonna know if somebody creepin’ up on you? Alright, see that? Now you can see everything.
Thufir Hawat slipped into the training room of Castle Caladan, closed the door softly. He stood there a moment, feeling old and tired and storm-leathered. His left leg ached where it had been slashed once in the service of the Old Duke.
Three generations of them now, he thought.
He stared across the big room bright with the light of noon pouring through the skylights, saw the boy seated with back to the door, intent on papers and charts spread across an ell table.
How many times must I tell that lad never to settle himself with his back to a door? Hawat cleared his throat.
Paul remained bent over his studies.
A cloud passed over the skylights. Again, Hawat cleared his throat.
Paul straightened, spoke without turning: “I know. I’m sitting with my back to a door.”
Hawat suppressed a smile, strode across the room.
Previous “Juxtaposition” posts can be found here.