Boat sirens, also called ship horns, have long been used on real vessels to signal departures, arrivals and warnings to other boats, especially in fog or busy harbours. Recordings of these blasts began circulating on soundboards and in video editing packs as a ready-made nautical effect. Online, creators adopted the short blast as a comedic exaggeration, playing a full-sized ship horn over tiny boats, cars or people entering a room. Its instant recognition keeps it popular for travel clips, sea-themed memes and any edit needing a loud maritime signal.