A few sushi restaurants in Tokyo have been doing this for a while now. You choose what you want on a touchscreen (usually an Android tablet, often running the

A few sushi restaurants in Tokyo have been doing this for a while now. You choose what you want on a touchscreen (usually an Android tablet, often running the same software across different restaurants) and a few minutes later your order gets sent to you on a rail separate from the normal conveyor belt. After you pick it up you press a red button on the tray in which your plates arrived and it goes back home. The nice thing about this is that it allows kaitenzushi restaurants to have table seating with the same wait as counter seating.