The losing horn comes from The Price Is Right, the long-running American television game show in which it plays when a contestant fails to win a prize or a pricing game. Over time, viewers began to recognise the descending brass phrase outside the studio, and editors lifted it into online videos, memes, and reaction clips as a universal signal for failure. Its spread was helped by how instantly it reads: even without seeing the show, most people understand the joke from the sound alone. That familiarity keeps it in regular use for fails, bloopers, and anticlimactic moments.