Kurt Warner went from stocking grocery-store shelves to playing arena football to eventually starting his Hall of Fame career in the NFL.
He's the poster boy for undrafted free agents. Below are the rest of the best unselected players in league history, as identified by NFL Nation reporters.
AFC East
Buffalo Bills
C Kent Hull
Hull's three Pro Bowls with the Bills are tied for second among undrafted players to have played for Buffalo, and his longevity with the team makes him the choice over other candidates such as Fred Jackson, Tony Greene and Booker Edgerson.