Yitzhak and Moshe were eating in a Chinese restaurant in London.

"Yitzhak," asked Moshe, "Are there any Jews in China?"

"I don't know," Yitzhak replied. "Why don't you ask the waiter? I'd be surprised if there were no Jews in China. Our people are scattered everywhere."

When the waiter came by, Moshe asked, "Are there any Chinese Jews?"

"I don't know sir, let me ask," the waiter replied, and went back to the kitchen.

The waiter returned a few minutes later and said, "No, sir. No Chinese Jews."

"Are you sure?" Moshe asked.

"I ask everyone," the waiter replied. "We have orange Jews, prune Jews, tomato Jews and grape Jews, but no one ever hear of Chinese Jews!"