The term 'Giant-Killer' is often used to refer to a person who has achieved something remarkable or unexpected, usually against a much larger and more powerful opponent. Two famous examples of Giant-Killers are David and JACK. David is best known for his victory over the giant Goliath in the Bible, while JACK is remembered for his victory over the giant in the fairy tale 'JACK and the Beanstalk'. Both stories have become iconic tales of courage and determination, and serve as an inspiration to many people.