This is certainly NOT a best/favorite Beatles song. But it's definitely worth listening to.
In 1974, during Lennon's "lost weekend", Paul joined John, Stevie Wonder, John's drinking buddy Harry Nilsson, Bobby Keys, and Jesse Ed Davis for a very loose studio jam. The jam was recorded and released as a bootleg called, "A Toot and a Snore." It has a Let it Be/Get Back-like vibe.
I am surprised to find this because I thought that John and Paul were through. Has me wondering, "What if..."