The phrase comes from Budapest's public transport announcements, operated under BKV and BKK on the city's metro network, where passengers hear 'Kérem vigyázzanak' as a standard safety warning around closing doors. Online, the clip has spread beyond Hungary as a recognisable transit sound, shared on soundboards by travellers and Hungarian speakers who know it from daily commuting. Its short length and unmistakably official delivery keep it useful as a reaction, even for listeners who do not understand Hungarian but instantly read the tone as a warning.