Sentry Bots are heavily armed patrol robots in the Fallout games, built to guard locations and warn anyone nearby before they attack. Their stand clear line became a favourite short clip among Fallout players because it sums up the games' mix of retro-futuristic politeness and sudden violence in just two words. Shared through gaming soundboards and meme edits, it now works far beyond Fallout itself, acting as a quick audio cue that a character, player or machine is about to cause serious trouble.