This one should go without saying, but apparently a lot of diners need reminding : "Snapping your fingers or whistling for me like I'm a dog... good way to ensure you get the bare minimum service from here on out. And I will remember you; as will the other servers." We're way past the era where it was acceptable for people to cry "Waiter!" from across the room or make condescending gestures to get their attention. A good server will promptly greet your table upon arrival (barring circumstances out of their control), and when you need to get their attention from that point on, a simple wave will suffice. Don't try to wave them down or talk to them when they're engaged with another table, though. Would you want someone interrupting them while they're taking care of you?