Have you ever noticed (at least on the good experiences) when you go to say, the grocery, or some retail store, etc, they always say something along the lines of "thank you, come again" or some such, or at least have a sign saying it or some such, but when you go to the doctor, noone EVER says that.
Probably because everyone knows you never want to see the doctor again ;D
Oh the humor we can find in our normal lives.