This might not exactly be a Beatley moment, but it was a Beatley light going off in my head. Either Paul or John said "Rubber Soul" came from one of Ringo's malaprops. I was happily driving along, listening to Revolver, when suddenly the double entendre of "Rubber Soul" hit me! The more I know, the more lights go off in my head like this 
ps - I wanted to cross post this to the "Rubber Soul" forum, but not knowing how, I just posted it twice (I doubt it will ...