The nun thinks for a moment and says, "I'm not too offended. I just have two requirements. One, that you be single, and two, that you be Catholic."
"Oh yes, Sister, I am single and Catholic," the driver replies, so they pull into an alley and the nun proceeds to satisfy the driver orally. After they're done, the driver begins laughing.
"What's so funny?" the nun asks. "Ha ha!" the driver annnounces, "I fooled you sister. The truth is I'm really married and I'm Jewish!"
"That's okay," the nun replies, "My name is Bob and I'm on my way to a fancy dress party."
