Charge by Attitude

Today I was reading through some news stories, and I came across one which I think is an inspired idea. A cafe owner in France put up this sign in his store....

The nicer you are to the server, the lower your price. All you have to say is, "Hello, a coffee please," and you are charged less.

The cafe owner insists the sign is a joke, but I bet there is a barista or three, that wouldn't mind doing this.

Charlie