A woman on the F train turns to the man next to her. 

"Excuse me," she says, "but are you Jewish?"

"No," replies the man.

A few minutes later the woman turns again. 

"Im sorry, but are you sure you're not Jewish?"

"I'm sure."

A few more minutes go by. 

"Are you absolutely sure you're not Jewish?"

"OK, fine. You win. Yes, I'm Jewish."

"It's funny," she says." You don't look Jewish."

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