I'm currently reading Alexandre Dumas Jr.'s La Dame aux Camélias (I've also seen this spelled Camilias and I don't know which one is right), which I recapped recently in the form of the opera La Traviata, which I saw on my honeymoon.
One of the footnotes in the back of the book led me to an interesting story about the 1870-71 Franco-Prussian War.
In the book (on page 103), the main character goes to a restaurant called Véry's. According to the accompanying footnote, "The Restaurant Véry opened in 1808 and was the first restaurant of standing to introduce fixed price menus.
"It was here, in 1871, that a patriotic waiter served coffee in a chamber pot to a Prussian officer who had demanded a cup from which no Frenchman had ever drunk".