One of our cats likes to do that. She will jump onto the countertop when you are washing your hands, and wants you to leave the tap running slightly so she can get a drink from it.
My cat, Leo, used to stand on the bathroom sink and cry, “Water!” It was unbelievable. He would half gargle to get the second syllable clear enough we knew whatnhe was saying.
People thought we were crazy until he did it for them.