What's what??

A taxi driver was driving along when a nun stuck her thumb out, so he pulled over. The nun got into the car, and the driver started driving along.
As he was driving along, they got to chatting, and the driver said, "My names Patrick and I'm a Catholic".
Then the nun said, "My name's Sister Mary, and I work in the local nunery".
They carried on talking, and the driver suddenly said, "Forgive me, Sister. But I have always wondered what it's like to kiss a nun".
The nun thought long and hard, and was thinking, well, he is a nice lad. So she said, "Alright then, Patrick".
So he pulled over and they shared a long meaningful kiss.
Then the driver started driving along again, and all of a sudden, he burst out crying. The nun said, "Whatever is the matter??"
He replied, "I lied to you. My name is not Patrick, it's Samuel, and I'm not a Catholic, I'm Jewish".
Then the nun started crying too, and she said, "I have a confession too. My names not Sister Mary and I don't work in the local nunery, my name's Kevin, and I'm on my way to a fancy dress party".