ATLANTA - A man who says he was fired by Caterpillar Inc. because he wasn't able to urinate for a drug test sued the equipment giant Wednesday, alleging discrimination. The plaintiff says he suffers from paruresis, more commonly known as shy bladder syndrome, and was physically unable to urinate into a specimen cup, despite having drunk 40 ounces of water and being given three hours to complete the task. Tom Smith, a 55-year-old assembly line worker, was suspended by Caterpillar a day after the aborted test in November, and dismissed on Dec. 5. "This is supposed to be a country...