Suddenly thrust into the national spotlight, he would defy the odds against him and stun the world with one of the greatest comebacks in history. Driven by love for his family, he willed an impossible dream to come true."
-"Cinderella Man," Eminem
It comes from the fairy tale 'Cinderella' who goes overnight from a lowly fireplace tender (CINDER-ella) to being a princess.
-Yup, a regular Cinderella Man.