On a dinner date, always be courteous to the waitstaff. Never snap, clap, cry “Waiter,” or worse, “Garcon!” to get your attendant’s attention; wait until you catch your server’s eye, then simply nod, gently raise your eyebrows, or, as a last resort, raise your hand. Say please and thank you — never say “Give me the steak frites…” If the food’s taking a long time, consider it an opportunity to get to know your date without worrying whether you have spinach in your teeth. And if you must complain about something — perhaps you’re vegan and the waiter brings you steak tartare, or perhaps there really is a fly in your soup — then do it nicely. It’s probably not the waiter’s fault, after all. Finally, if you’re responsible for the tip, make it 20%. We don’t care if your standard policy is 10% (or “whatever change is in my pocket”); on a date, you make it 20, you cheap bastard. Why? Well, if human decency isn’t enough to compel you, then consider this: If you are in any way rude and obnoxious to the service industry professionals, it will suggest to your date that you have the potential to be rude and obnoxious to anyone. And that, our friend, does not get you laid.