BVG, short for Berliner Verkehrsbetriebe, is Berlin's main public transport operator, running the U-Bahn, buses and trams across the city. The Infogong is its signature signal tone, played in stations and vehicles just before passenger information announcements. Because millions of commuters hear it daily, the chime is instantly recognisable to Berliners and transit fans, who have ripped and shared it online for years. Meme creators adopted it as a framing device: a few seconds of the gong tells the audience that an 'official message' is coming, which makes the parody that follows hit harder.