In January 1927 Gus Comstock, a barbershop porter in the small Minnesota town of Fergus Falls, drank eighty cups of coffee in seven hours and fifteen minutes. The New York Times reported that near the end, amid a cheering crowd, the man's gulps were labored, but a physician examining him found him in pretty good shape. The event was part of a marathon coffee-drinking spree set off two years earlier by news from the Commerce Department that...