Last night, dining in Coral Gables, I came across a new social unknown. We were a group of six, at the wonderful restaurant Cacao, waiting for our dinner. The plates arrived two by two, and each person who received his or her plate politely waited for the other people to receive theirs. This was the proper etiquette that I had been taught growing up. Then, when all the plates had arrived, one person at the table was still busy texting. And I wondered: Should I wait until he's ready to start eating, or should I pick up my fork, stab one of my shrimps, and flick it over onto his BlackBerry as a sign that it's time to address the food? Any suggestions?