No matter how long you watch or how hard you pay attention, you can't always explain away human behavior. Some of the most inexplicable cases wind up in the hospital, on both sides of the OR table. If you witness any of these major and minor frustrations - and you do almost every day, shaking your head, rolling your eyes and muttering, "God forbid" - an entire procedure can reasonably be boiled down to one question: "What were they thinking?"