Yo Sushi has never been a franchise known for its friendly wait staff.  In fact, the company seems to do its best to avoid waitstaff altogether!  In its latest attempt to push the boundaries of completely un-humanized service it is employing flying robot waiters (seem to be AR Parrot Drones) in the form of what they call the ‘iTray’ system.  Apparently, it’s not so ready for prime time as the flying robots can’t seem to land well enough just yet:

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http://www.guardian.co.uk/lifeandstyle/video/2013/jun/10/flying-tray-burgers-london-restaurant-video