The melody comes from Titanic, the 1997 romantic drama directed by James Cameron, which became a global cultural phenomenon and made its theme one of the most recognisable film melodies ever recorded. As short video platforms grew, tiny excerpts of the theme began circulating as shorthand for romance, tragedy and melodrama, often used ironically rather than sincerely. Its staying power comes from that instant recognition: even a couple of seconds is enough for viewers to understand the joke or the emotion without any explanation.