Lyric discussion by RABBIDpanda 

Ringo has discussed the fomration of the song. Like mentioned, he got angry during the album recordings and stormed out, taking a trip near the ocean. He mellowed out, and came back with an idea for a song.

Oh, and Re: Guy making drug connection to snow white. The Disney version you reference came out in 1937. Up until much later, cocaine was by and large created as a translucent liquid, and not the white powder seen today. If you'd like more proof, the origins of the story go back about 120 years before that version ever saw the light of day either. Sorry to ruin such a good story.

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