Foghorns have long been used at sea to warn ships in low visibility, and their deep, carrying tone is why the sound works so well as an exaggerated alarm online. Short horn clips circulate on soundboards as prank and reaction sounds, where the joke is the mismatch between a gentle morning routine and a blast meant for a harbour. Unlike a softer phone alarm, this version is chosen when a creator wants an immediate, unmissable interruption, similar to the shock value of an air horn in meme edits.