Arrowsmith by Sinclair Lewis

The prairie was hot, the wheat rattled in a weary breeze, the day-coach was gritty with cinders. Martin was cramped by the hours of slow riding. He drowsed and smoked and meditated. "I'm going to forget medicine and everything else," he vowed. "I'll go up and talk to somebody in the smoker and tell him I'm a shoe salesman."

He did. Unfortunately his confidant happened to be a real shoe salesman, with a large curiosity as to what firm Martin represented, and he returned to the day coach with a renewed sense of injury. When he reached Minneapolis, in mid-afternoon, he hastened to the University and besought a ticket to the Sondelius lecture before he had even found a hotel, though not before he had found the long glass of beer which he had been picturing for a hundred miles.