The melody comes from Eduard Khil's 1976 performance of 'I Am Glad, 'Cause I'm Finally Returning Back Home,' a wordless vocal that became a global internet meme around 2009 when clips of his cheerful performance spread across video sites. Its bouncy, nonsensical lalala style made it perfect for ironic celebration and absurd humour, and it has stayed in meme culture ever since. This rainbow-themed laugh variant follows that same spirit, remixing the familiar tune with giggling to make the joke feel brighter, sillier, and instantly shareable.