This clip uses the traditional Happy Birthday tune, one of the most widely recognized celebration songs in the world. Because the melody is instantly familiar, it spread naturally across home videos, messaging apps, meme edits, and short form social posts. Online, people keep using it because it quickly tells viewers what the moment is without any setup. It also works in two opposite ways: as a genuine birthday greeting or as a deadpan joke when paired with disappointing, chaotic, or offbeat visuals.