It was the ditty that marked the end of David Cameron's time as British Prime Minister. Then, the internet got hold of it and created a musical monster.
Cameron, after outlining his plans to exit Downing Street and transfer power to Theresa May, walked off with a musical "doo, doo, doo, doo."
Perhaps Cameron was so relieved his final address was complete he momentarily forgot himself - and that his mic was still recording.
Or maybe he was thrilled to be packing up his house and leaving the role of prime minister behind him.