Detroit Lions fans know how entertaining and how intense, in a good way, head coach Dan Campbell can be. He's a lot of fun and players love him, but he's not afraid to do things that get players hyped up.

When he was a player for the Dallas Cowboys, Detroit Lions head coach Dan Campbell was used as a secret weapon by head coach Bill Parcells, who had Campbell start fights to motivate players.

Todd Haley, a former Cowboys assistant coach, recently relived a wild practice story that involved Parcells and Campbell.