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."
Mechanical Horse Sculpture Gallops In Place
'Rod placed the brain inside the panel... the horse raised its head, wiggled its ears, blinked twice, gave a tentative whinny.' - Christopher Stasheff, 1969.
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Orion's 'Skip-to-M'Lou' Entry
'A lightning pilot possibly could land that tin toy without power and still walk away from it provided he had the skill to play Skip-to-M’Lou in and out of the atmosphere...'