[felixnm]

I've only seen this at one place - a Japanese restaurant in Boulder, CO. Each table has a small red button with a weighted base, right next to the soy sauce and cube of extra gari.

You press the button, a server appears a few seconds later. Need to order, press the button. Need water, press the button. Need the check, press the button. Need for them to pick up credit card, press the button. I love it; it's like a flight attendant call button and I never have to wait for anything.