There are two Jewish men sitting in a wonderful deli frequented almost
exclusively by Jews in the Jewish section of town. They are talking among
themselves in Yiddish.
A Chinese waiter comes up and in fluent and impeccable Yiddish, asks them if
everything is okay, can he get them anything, and so forth.
The Jewish men are dumbfounded. "My God, where did he learn such perfect
Yiddish?" they both think. After they pay the bill they ask the manager of
the store, also fluent in Yiddish.
"Where did your waiter learn such fabulous Yiddish?"
The owner looks around and leans in so no one will hear and says, "Shhhh.
He thinks we're teaching him English."