Well, all 4 Beatles are alive in the mp3, so it's at least 25 years old. I think Paul (? It's embarrssing that I'm such a fan (http://www.livejournal.com/users/aura218/9117.html), yet I don't know who lead on which song) was goofing around, hence picking a less common phrase.

Do you know at all where the expression came from?