20. Johnny Unitas (1955)
One of the greatest quarterbacks in history, Unitas is a football icon. The Baltimore Colts star won a Super Bowl as well as three NFL Championships. He enjoyed 18 seasons at the top but worked incredibly hard to get there. In 1955, the Pittsburgh Steelers drafted him but Unitas didn’t make the cut for their final roster. They thought he didn’t have the brains to be a top-tier QB.

Unitas’s career humiliated the Steelers. He refused to give up on his dream and even played as a semi-professional for only six dollars a game (via Sportscasting). But Unitas attracted attention with his exploits and won trials with the Cleveland Browns and the Colts. Ultimately, that’s where he spent the overwhelming majority of his Hall of Fame career.