I'm trying to settle an argument. Under what circumstances, if any, is it appropriate to initiate a conversation with someone not of your party seated next to you at a sushi bar?
At one end of the spectrum, I've heard one person (a lifelong New Yorker, of course) say that the urban code obliges you to pretend that the other person doesn't even exist. The moderates seem to feel that you should at least be allowed to inquire which sushi roll the other person is eating. And one bachelor I know swears by them as pickup spots.