The line comes from The Lord of the Rings: The Return of the King from 2003, spoken by Viggo Mortensen as Aragorn at the Black Gate of Mordor. His army is badly outnumbered and the charge is meant to distract Sauron while Frodo reaches Mount Doom. Online, film fans clipped the short whisper because it works without any other context. It has since become a reaction for loyalty and selfless bravery, often used ironically for tiny tasks that friends treat like a heroic mission.