Pharrell Williams wasn’t so "happy" when he made his mega-hit song of the same name.

In a recent interview with Zane Lowe for Apple Music 1, Pharrell revealed the surprising origin story of Happy, sharing that the upbeat anthem — which took over the airwaves in 2013 — was actually born out of “sarcasm.”

Reflecting on that creative period — the same period which saw the release of his songs Get Lucky and Blurred Lines — the 51-year-old music mogul said he was facing a creative block while working on the Despicable Me 2 soundtrack.

He recalled asking himself a rhetorical question, “How do you make a song about someone so happy that nothing brings them down?”

The 13-time Grammy winner continued, “And I sarcastically answered it and put music to it, and that sarcasm became the song."

Happy became a cultural phenomenon, racking up over 13.9 million copies sold worldwide. It topped the charts and was declared the most-played song on British radio throughout the 2010s. 

The song even broke records for the longest music video, with Pharrell's original 24-hour version holding the title until Twenty One Pilots surpassed it in 2020.