Are you sure ?

A woman on a train walked up to a man across the table. “Excuse me,” she said, “but are you Jewish?”

“No,” replied the man.

A few minutes later the woman returned. “Excuse me,” she said again, “are you sure you’re not Jewish?”

“I’m sure,” said the man.

But the woman was not convinced, and a few minutes later she approached him a third time. “Are you absolutely sure you’re not Jewish?” she asked.

“All right, all right,” the man said. “You win. I’m Jewish.”

“That’s funny,” said the woman.” You don’t look Jewish.”