In this French café, rudeness will cost you more
It's appropriate that this story is from Nice.
From The Local, a blog offering news from France in English, about La Petite Syrah, a café in Nice:
“A coffee” will set you back €7, according to the sign, while “a coffee please” is a little more affordable, at €4.25.
If you want keep your expenses down, and stay friends with your local barista, however, the best option is “Hello, a coffee please,” which will only cost you €1.40.