SETTING— My "Liberry." A male patron opens and walks through the outer door of our building, passing through the open inner door, carrying a pile of books.
MAN— Any reason your book return's locked?
ME— Yes. We lock it during the day.
MAN— (Stares at me for a long moment, perhaps sensing my inner snotty attitude) You lock it during the day?
The man shakes his head, drops his books on the circ desk, walks back toward the exit, closes our inner door behind him as he passes through the outer one, doing so quickly so as not to give me time to say, "Actually, sir, that's a door we keep open during the day."