In that thread, one person wrote that the first time he played Moondance, it was called at a gig. He thought it would be easy, but he butchered it.
I have the vague recollection that the same thing happened to me; it was called at a party I was playing, I thought it would be easy, but when I started playing, I suddenly realized it wasn't as easy as I thought.
I have another vague recollection that later I sat down and learned it. But that's been decades ago, and I doubt I remember it now.