The dermatologist sat straight-backed and still in the witness chair as Lang fired questions at him. He tried not to get flustered. A friend of mine, a pediatric plastic surgeon who had had a malpractice suit go to trial, told me the instructions that his lawyer had given him for his court appearances: Don’t wear anything flashy or expensive. Don’t smile or joke or frown. Don’t appear angry or uncomfortable, but don’t appear overconfident or dismissive, either.