One-Liner

"Kat: Now say something witty to the Enigmarons and finish the mission! Antimony: Do I have to?"

- Gunnerkrigg Court

""Enough is enough! I have had it with these motherfuckin' snakes on this motherfuckin' plane!""

- Neville Flynn, Snakes on a Plane

Any line of dialogue which demonstrates remarkable wit and composure for someone in that particular situation. Whereas a normal person would freak out upon finding (for example) a pack of dogs mauling a dead lawyer, the main character gives a wry smirk and says, "Well, I always said the legal profession was going to the dogs," thereby proving that they're Just That Cool.

Differs from a Catch Phrase in that repetition is a key component of the Catch Phrase. The One-Liner is typically used once and never again.

Variations and Sub-tropes:
Just after killing someone. Facing down death. When a character enters the scene. When it is reinforced by immediate repetition by others (non-immediate repetition by the same character elevates it to a Catch Phrase). When it is addressed to a character and then repeated by the original speaker. Immediately before passing out. Just before a fight. Delivered just before the killing blow; in other words, used to end fights. Used to segue into a commercial break. Used to end an episode in a rather dark way. Delivered after Slipping a Mickey but before the victim departs from consciousness.
 * Bond One-Liner
 * Facing the Bullets One-Liner
 * Incoming Ham
 * One-Liner Echo
 * One-Liner, Name. One-Liner.
 * Parting From Consciousness Words
 * Pre-Ass-Kicking One-Liner
 * Pre-Mortem One-Liner
 * Quip to Black
 * Schiff One-Liner
 * Wham! Line
 * Why Can't You Say Good Night?