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.
THEY SAID THE THING!
and then there’s Doctor Who
and then there’s
10 PERSONAL FAVOURITE DISNEY SONGS —>  Be Prepared
↳ “So prepare for the coup of the century. Be prepared for the murkiest scam. Meticulous planning, tenacity spanning, decades of denial is simply why I’ll be king undisputed, respected, saluted and seen for the wonder I am! Yes, my teeth and ambitions are bared. Be prepared!”