Sam’s roommates were a pair of trust fund sisters from Evanston—two wisp-thin girls named Darla and Shannon who seemed to exist exclusively on a diet of Dentyne chewing gum and hot tea. For four years they had terrorized our college campus with their pointy, elfin noses and eccentric ways. Darla and Shannon had always looked upon me, on the rare occasions when they looked upon me at all, with vague disdain. They acted as if I’d wandered onto campus straight from the set of the TV show Hee Haw, which featured overalls-wearing hillbillies singing in cornfields and blowing into empty moonshine…