Just about that time a strange thing began to haunt me. It was this: I had forgotten something. There was a decision that I was about to make before Dean showed up, and now it was driven clear out of my mind but still hung on the tip of my mind’s tongue. I kept snapping my fingers, trying to remember it. I even mentioned it. And I couldn’t even tell if it was a real decision or just a thought I had forgotten. It haunted and flabbergasted me, made me sad.

— Jack Kerouac, On the Road, 1957, Viking Press