McCoy: Have you ever seen a victim of Rigelian fever? They die in one day. The effects are like bubonic plague.
Flint: Constantinople, summer 1 334. It marched through the streets, the sewers. It left the city by ox cart, by sea, to kill half of Europe: the rats, rustling and squealing in the night as they, too, died. The rats...
Spock: Are you a student of history, sir?
Flint: I am.