It was a hotel clerk I met in New York

An Englishman took a business trip to New York. 

When he arrived, the hotel clerk asked him a riddle. "My mom and dad had a baby. It wasn't my brother. It wasn't my sister. Who was it?"
 
The Englishman thought long and hard, but eventually gave up. "I don't know who was it?"
 
The hotel clerk responded, "It was me!"
 
The Englishman thought that was hilarious. He couldn't wait to get home and tell this funny joke to his family and friends in England.
 

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When he arrived home they met him at the airport and he asked them: "My mom and dad had a baby. It wasn't my brother. It wasn't my sister. Who was it?"
 

His friends thought and thought about it until they gave up. So he told them, "It was a hotel clerk I met in New York."