I've always thought the simple coding interview questions was like asking a chef to prepare a very simple meal; they should be able to do it without any problem. Though it's apparent that coders, like chefs, can choke on even these simple tasks. You only need to watch the "skills tests" on "Masterchef: The Professionals" to see a dozen professional cooks fail to fry schnitzel or fillet a fish. The same chefs go on the create some fantastic dishes in less stressful challenges.