Business lunches and dinners, as anyone who has attended many of them knows, are not about fun - they're about business, writes Fortune's Anne Fisher in her August 23 Ask Annie column. Nevertheless, many interns, new grads, and yes, experienced execs, forget certain basic niceties and end up making gaffes like asking a client out or drinking too much. What was the best or worst business lunch (or dinner) you ever sat through? Have you, a staffer, or client committed a business-meal faux pas? Got any more rules for successful business lunching?