Take a look at this video of a QR-2 robot acting as a bartender (or waiter, depending on how you see the role of a bartender) thanks to helpful programming and research by thirsty folks at Carnegie Mellon.
(QR-2 robot bartender shows how it works)
In his 1943 story Q.U.R, sf great Anthony Boucher writes about a usuform robot bartender, a robotic device optimized for the task:
There sat the first original Quinby usuform - no remake of a Robinc model, but a brand-new creation. Quniby said, "Three Planets," and he [the robot] went into action. He had tentacles, and the motions were exactly like Guzub's except that he himself was the shaker. He poured the liquids into his maw, joggled about, and then poured them out of a hollow hoselike tentacle."
Boy Makes Biomimetic Turtle Robot
't came out into plain view. Darkington glimpsed a slim body and six short legs of articulated dull metal.'
Origin F1 Humanoid Robot's Facial Skin
'I could look down at that face of carefully molded synthetic rubber, tinted the exact shade of the doctor's living flesh.' - Rog Philips, 1950.
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Boy Makes Biomimetic Turtle Robot
't came out into plain view. Darkington glimpsed a slim body and six short legs of articulated dull metal.'
Elon Musk Wants Data Centers In Space
'Internally it’s made up of millions of components, but the most important ones are the thinking and memory parts of the Mind proper.'
Origin F1 Humanoid Robot's Facial Skin
'I could look down at that face of carefully molded synthetic rubber, tinted the exact shade of the doctor's living flesh.'