This joke fits in with the vocabulary unit on Nationalities.
A Swiss man visiting Sydney, Australia, pulls up at a bus stop where two locals are waiting. "Entschuldigung, können Sie Deutsch sprechen?" he asks.
The two Aussies just stare at him.
"Excusez-moi, parlez vous Francais?" he tries.
The two continue to stare.
"Hablan ustedes Espanol?"
The Swiss guy drives off, extremely disgusted. The first Aussie turns to the second and says, "Y'know, maybe we should learn another language."
"Why?" says the other. "That guy knew four, and it didn't do him any good."