Language Barrier

Two highway workers were busy working at a construction site when a big car
with diplomatic license plates pulled up. 
"Parlez-vous français?" the driver asks them. The two
workers just stared.
"Sprechen Sie Deutsch?" The two continued to stare at him.
"Fala português?" Neither worker said anything.
"Parlate Italiano?" Still no response.
Finally, the man drives off in disgust.
One worker turned to the other and said, "Gee, maybe we should learn a
foreign language..."
"What for? That guy knew four of them and what good did it do him?"