"The Karate Kid" is a semi-autobiographical story based on Kamen's life. When Kamen was 17, he was beaten up by a gang of bullies after the 1964 New York World's Fair. He thus began to study martial arts in order to defend himself. Kamen was unhappy with his first teacher who taught martial arts as a tool for violence and revenge. So he moved on to study Okinawan Gōjū-ryū Karate under a teacher who did not speak English but himself was a student of Chōjun Miyagi.