"What's the secret?"
Q: The song talks about the beginning of your friendship with John Lennon, and you mention a secret that you kept. Are you able to tell us what that secret was? Paul: No, I mean, that's the secret, you know. The lyrics is, "We met at Forthlin Road and wrote a secret code." So I'm meaning we wrote songs, but you did, you had secrets that only you two know. That's what brings you together.
It would be interesting if someone asked him about the “promise”, rather than just the “secret code.” The code can easily be explained away as referring to songs they wrote, like Paul does here (and I do think Paul is telling the truth there btw. He has said many times that he reveals things in his songs). But the promise feels much more personal, because he specifically says he’s still keeping it to this day.
