Buffy the Vampire Slayer - TV Trope: Title Drop (Part 5 / 5)
(Part 1 - Part 2 - Part 3 - Part 4)
Title Drop: If a line of dialogue is the title of the episode, movie, or book, it obviously must have some great significance. If it sounds completely random, that just means the true meaning of the title has yet to be revealed. So when a character is heard using the title in dialogue, the audience sits up and takes notice, because the scriptwriter has just planted a neon sign that flashes THIS CONVERSATION IS IMPORTANT.