Joke - The English speak English

I read a humorous joke today that perfectly expresses the usefulness of knowing multiple languages and the, generally, limited language abilities of native English speakers. It was posted on the Ex-pats-in-Zurich Yahoo! group by dominichiggins:

A Swiss traveler, requiring directions, pulls up to a bus stop where two Englishmen are waiting.

"Entschuldigung Sie, koennen Sie Deutsch sprechen?" he politely inquires.

The two Englishmen respond with a silent stare.

The Swiss man tries again, "Excusez-moi, parlez vous Francais?"

The two continue to stare back at him.

"Parlare Italiano?" he tries.

No response.

"Hablan ustedes Espanol?"

Still nothing.

Finally, disgusted with the pair, the Swiss traveler drives off.

The first Englishman turns to the second and says, "Y'know, maybe we should learn a foreign language..."

"Why?" says the other, "That bloke knew four of 'em and look at all the good it did him."