The line opens Happy, Pharrell Williams' upbeat song first released in 2013 for the Despicable Me 2 soundtrack and later issued as a worldwide hit single. Its sunny, singalong style helped the track become one of the most recognisable pop songs of the decade, and the opening lyric is now widely quoted on its own. Short-form creators borrow just those few seconds because the familiar melody instantly signals optimism, making it a handy shorthand for an idea that sounds strange before it turns out to make sense.