Going out to dinner, or eating in front of other people, can be a minefield of potential embarrassments just waiting to catch you off-guard. It's fun, too, of course, but whether it's a first date, a business meeting, or a meal out with new friends, eating in front of other people can be stressful. You want to make a good first impression, after all. Even if you think you've got it down, you could be making common table etiquette mistakes that you need to know are embarrassing you without even realizing that you're making them.
Knowing how to conduct yourself at the dinner table is a useful skill, whether you're in the corporate world or not. People notice manners and you're never going to disappoint someone by being too well-mannered or polite. One of the worst feelings is finding out later that you made a poor first impression without even realizing that you were making common etiquette mistakes. You drank out of the wrong water glass, set your silverware back on the table between courses, or put your napkin on the table before the end of the meal and everyone else at the table noticed. This is the stuff of nightmares. Very tame nightmares, sure, but still, it's embarrassing to think that people think less of you because you have bad manners, especially if you don't even know that you have them.