Lennon contributed the pessimistic viewpoint, coming up with the line, "It can't get no worse." McCartney usually wrote much happier lyrics than Lennon.
Lennon revisited this song when he used the lyrics, "Every day, in every way, it's getting better and better" for his 1980 track "Beautiful Boy (Darling Boy)
." This time, instead of taking the cynical side, he was affirming that life does just get keep getting better and better.
Leigh - NY, NY