Two days later, on Saturday morning, I arose, a tottering wreck, and went forth to fulfil an engagement with a valued friend, the Rev. Mr. ———, to walk to the Talcott Tower, ten miles distant. He stared at me, but asked no questions. We started. Mr. ——— talked, talked, talked as is his won't. I said nothing; I heard nothing. At the end of a mile, Mr. ——— said "Mark, are you sick? I never saw a man look so haggard and worn and absent-minded. Say something, do!"
Mark Twain – A Literary Nightmare