"She thinks to intimidate me by the use of quarter hours."

"Dear Miss Brodie,
I hope it will be convenient for you to see me in my office this afternoon at 4:15.
Emmaline Mackay

4:15, not 4:00, not 4:30, but 4:15 --

She thinks to intimidate me by the use of quarter hours."

Maggie Smith delivers this line (as so many others in this movie) brilliantly.