Bonus point quiz question: ultimate quarterback controversy.
Tom Landry, coach of the Dallas Cowboys, was the first coach to send in the plays. Previously, quarterbacks called the plays in the huddle, theoretically following a game plan that the coaches had bashed into their head during the week. Landry came up with the alternating guard, substituting a lineman on every play to deliver the play to his quarterback. During the ultimate quarterback controversy two quarterbacks alternated starts, and famously in one game Landry upgraded his alternating guard system by alternating his quarterbacks every play, sending them each in with the play he wanted run.
Twenty points (if you don't google) for the first to name one of the two quarterbacks, fifty if you get them both in the same post. You have to allow two other people to take a shot before you can try again.