What's better than killing your most hated enemy? Sending them into the afterlife with your voice in their ears and the proof of your badassery in their head, that's what. Another common staple of the Action Hero, this finishing quote need not be a One-Liner, but the longer your little speech goes, the more likely the bad guy will find some way to evade your intended killing blow or worse, make you Talk to the Fist. Consequently, Genre Savvy heroes are advised to just Kill Him Already! and save the pithy quotes for immediately afterwards. Of course, sometimes (as in the Heroes and Matrix examples) it seems that a Pre-Mortem One-Liner somehow paralyzes your enemy while you deliver it, or maybe they're just courteous.
Alternatively, the quote can be said in that short window of time after the killing blow is struck, but before your enemy's consciousness fades, as a metaphorical way of adding salt to the wound. Be warned, however, that if your enemy still has motor control, the quote might spur them to pull off a Taking You with Me.
The monstrous equivalent is less articulate. Not to be confused with a Pre-Asskicking One-Liner, which is used at the beginning of a fight; these quotes are used to end the fight. Also related but different is a one-liner delivered when escaping from battle.
Give My Regards in the Next World and See You in Hell are subtropes. Compare Bond One-Liner (aka Post-Mortem One-Liner), which is said after the victim's consciousness has faded, and directed at the audience, to another character, or just to oneself. If the victim is the one speaking, it's Defiant to the End or "Facing the Bullets" One-Liner.
