One of my (many) favorites! Interestingly, Geoff Emerick's account of Paul first presenting this to the band is wildly different than what's been posted here. Emerick says Paul came into the studio, sat at the piano, and said something like "Gather 'round boys, and have a listen to our next single!" I'm paraphrasing a bit here, but Emerick goes on to say how John shoots a jealous sideward glance at Paul, how he felt threatened because he of course wanted to write the singles, etc etc.
While I think his book is interesting and informative on the technical aspects of the recordings, it is very obviously biased towards Paul. The way he presents Ringo is just awful, too.