The Hitchhikers Guide to the Galaxy
"He had found a Nutri-Matic machine which had provided him with a plastic cup filled with a liquid that was almost, but not quite, entirely unlike tea. The way it functioned was very interesting. When the DRINK button was pressed it made an instant but highly detailed examination of the subject's taste buds, a spectroscopic analysis of the subject's metabolism and then sent tiny experimental signals down the neural pathways to the taste centers of the subject's brain to see what was likely to go down well. However, no one knew quite why it did this because it invariably delivered a cupful of liquid that was almost, but not quite, entirely unlike tea. The Nutri-Matic was designed and manufactured by the Sirius Cybernetics Corporation whose complaints department now covers all the major landmasses of the first three planets in the Sirius Tau Star system."