00:02What is it called when a quarterback changes plays at the line of scrimmage?
00:54Welcome to the NFL's Football Trivia Challenge.
00:58Experience the rich tradition of professional football with Tom Brookshire and me, Pat
01:02Summerall, as you pitch yourself against the toughest football minds in the country.
01:07But don't be fooled.
01:08Strength and endurance won't win this game, but a quick reaction and a little knowledge
01:13might.
01:14Get ready.
01:15We're about to kick off.
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