We all know Peyton Manning is a pretty tough guy. The Denver quarterback returned from four neck surgeries last season to lead the Broncos to a 13-3 record and nearly claim his fifth NFL most valuable player award.
But there was a time when Cooper Manning had no trouble making his younger brother cry on the football field. Of course, that time was the late 1970s and early 1980s, when Peyton was just a toddler.
Plenty of such home-movie footage will be seen by the world when the ESPN documentary "The Book of Manning" airs on Tuesday night.
In the preview clip above, it's quite amusing to see the future Super Bowl champion in tears and howling things like "That hurts!" and "You can't grab by the neck!" while playing football with Cooper and his friends, who call the surefire Hall of Famer a crybaby.
Cooper is a one-time highly touted high school receiver whose football career ended when he was diagnosed with spinal stenosis. He is a central figure in the documentary, telling the story of the football lives of the sons of legendary New Orleans Saints quarterback Archie Manning.
According to Cooper, youngest brother Eli, the two-time Super Bowl champion quarterback of the New York Giants, was the opposite of Peyton when they were growing up.
"He wouldn't cry," Cooper said of their baby brother.