He leaped from his chair, ripped off his microphone, and lunged at his ex-wife. Security guards rushed to intercept him. The audience screamed, then cheered. Were producers concerned? Not at all. They were getting what they wanted: the money shot. From "classy" shows like Oprah to "trashy" shows like Jerry Springer, the key to a talk show's success is what Laura Grindstaff calls the money shot--moments when guests lose control and express joy,...