Tom Cruise's very public meltdown continued Friday on NBC's Today show. During an interview with Matt Lauer, Cruise went postal when the topic turned to his recent criticism of Brooke Shields for taking antidepressants. "You don't know the history of psychiatry," the Scientology-obsessed actor snapped at Lauer. "I do. You don't even know what Ritalin is. If you start talking about chemical imbalance, you have to evaluate and read the research papers on how they came up with these theories, Matt, OK. That's what I've done." Paging CVS rapid refill...