Cameron sings after announcing departure

David Cameron has gone out not with a bang, nor a whimper, but a mystery tune.

Seconds after the British prime minister finished telling reporters of his intention to step down from office this week, he walked back through the door of his Downing Street residence — and the live microphone he was still wearing caught him in an unguarded musical moment.

“Do doooooooo, do doooo,” he sang to himself, according to the clip sent by BBC reporter Daniel Sandford.

David Cameron: "Thank you very much……………………doo, doo, doo, doo. Right…Good." (The End) pic.twitter.com/Z1zHgSlkLf

— Daniel Sandford (@BBCDanielS) July 11, 2016

It wasn’t immediately clear what tune Cameron was singing, but the social media world poured forth with often-satirical suggestions. One writer opined that Cameron had just unwittingly revealed the secret “Open Sesame” musical code for the Downing Street door. Another theorized that it was Cameron’s personal “game over” videogame hook. Some thought they detected a hint of “The West Wing” theme tune.

Soon, hastily remastered clips of Cameron’s doings accompanied to the beats of Dr. Dre were doing the social media rounds.