One restaurant industry expert is sharing secrets on how to make dining out a great experience. Darron Cardosa, who spent 30 years as a server, is the author of "The B****y Waiter” and he has advice on what to do in a restaurant. He says rule No. 1 is to drop that cell. “Please just put your phones down when you see your server come up. It’s just polite. It’s friendly, do it,” Cardosa told Inside Edition. Another thing to avoid is showing off by telling the waiter you're a big tipper.