You know the part that goes: "Whatever happened to, the love that we once knew ...".
Well until just now, I'd only heard the final released version, and my whole life I thought "Well, that is obviously Paul writing a middle eight because John left the song unfinished, sounds great, smooth transition, just like they used to finish each other's songs in the old days ...".
Then I heard this demo on beatlesradio.com ... they had what sounded like a home cassette early version of John working on the song, and the middle eight part was there - it was his all along!
You all probably knew that, but I was gobsmacked. It was a little different, in that it got back to the main song in a little different way (Paul did a nice job with that part!), but it was definitely John's part.
You go, boy!!