If a waiter reads the needs of your table correctly, you're likely to end up with a good experience. Inadvertently giving off the wrong signals can doom a table to service that's too rushed, too slow or just off kilter. Here, how to work the system.
If you act moody... You may get better service. Several waiters said they are more careful to get every detail right when they believe a table is already in a bad mood (a couple fighting or a tense business meal perhaps).