I ran into this video of a machine in a German restaurant which delivers food down a track :
Although the germans made a whole restraunt around their machine,
they were not the first to think of a "food serving" machine!
The Emett breakfast machine from the classic; Chitty Chitty Bang:
Come to think of it, although the german machine looks like a very
efficient machine, Emett's machine wins hands down on
the fun and risk factor!