'Zurückbleiben, bitte' — 'please stand back' — is the standard automated warning played on German trains and subways, most famously on Berlin's U-Bahn, as the doors are about to close. The clipped, authoritative delivery made it instantly recognizable to commuters and a staple of German internet humor. It spread beyond the platform through meme edits, reaction videos and soundboards, where the short runtime makes it a perfect drop-in gag. Today it is used worldwide as a tongue-in-cheek order to back off, even by people who speak no German.