"So that means, you're a doctor, you're a doctor, you're a doctor, you're a doctor and, Howard, you know a lot of doctors" Episode - The Roommate Transmogrification After several jokes about Leonards faulty digestive system, Bernadette announces that she is getting her PHD. Leonard goes on to ask Howard how it feels knowing that when they get married, they'll be referred to as Mr. and Dr. Wolowitz?