' Do we really need to say "Thank you" if a server refills our water glass? ' Yes. The server is human being, not a robot. Small social graces go a long way

' Do we really need to say "Thank you" if a server refills our water glass? ' Yes. The server is human being, not a robot. Small social graces go a long way in maintaining a civil society. (And we should be saying, "please", as well.) "It seems to lessen the value of two words when someone does an unexpected favor." In those cases you can add more oomph to your voice, or say "Thank you very, very much!"