The line comes from the Chaos faction in Warhammer 40,000: Dawn of War, the real-time strategy game released in 2004 and set in Games Workshop's grimdark science-fiction universe. Chaos forces in the game speak in distorted, menacing voices that match their corrupted, war-obsessed identity, and this warning fits that tone perfectly. Shared later as a standalone soundboard clip, it found a second life among strategy players and meme editors who use it whenever treachery, revenge, or a sudden turn against an ally takes centre stage.