Oh, and under Doctor Who Fandom Rule Number Three, I'm declaring Jack's unfortunate future plastic surgery job to be of questionable canon.

I personally think that Jack knows more about The Doctor than The Doctor thinks, being clever and sneaky and, you know, ex-Time Agent. And thus in my personal canon, Jack's little story about his nickname was a deliberate mindf**k aimed at The Doctor as small payback for all the shit The Doctor has put Jack through.