Thief of Time - Look

It was always very hard to disapprove of Miss Susan in her presence, because if you did she gave you a Look. It was not in any way a threatening look. It was cool and calm. You just didn't want to see it again.

The Look worked in the classroom, too. Take homework, another Archaic Practice the headmistress was ineffectually Against. No dog ever ate the homework of one of Miss Susan's students, because there was something about Miss Susan that went home with them; instead the dog brought them a pen and watched imploringly while they finished it.

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The Thief of Time - p26