For Whom the Bell Tolls (1940)

“Don’t call me Don Roberto.”
“It is a joke. Here we say Don Pablo for a joke. As we say the Señorita Maria for a joke.”
“I don't joke that way,” Robert Jordan said. “Camarada to me is what all should be called with seriousness in this war. In the joking commences a rottenness.”
“Thou art very religious about thy politics,” the woman teased him. “Thou makest no jokes?”
“Yes. I care much for jokes but not in the form of address. It is like a flag.”
“I could make jokes about a flag. Any flag,” the woman laughed. “To me no one can joke of anything. The old flag of yellow and gold we called pus and blood. The flag of the Republic with the purple added we call blood, pus and permanganate. It is a joke.”
“He is a Communist,” Maria said. “They are very serious gente.”
“Are you a Communist?”
“No I am an anti-fascist.”