Brett Favre of the Green Bay Packers, throws the ball during the 3rd pre-season game at Paul Brown Stadium in Cincinnati, Ohio on August 28, 2006. Photo by Dan Beineke-WireImage.com.

John Elway of the Denver Broncos in action during the game against the New York Giants at Giants Stadium in East Rutherford, New Jersey. The Giants defeated the Broncos 21-16. Photo by Getty Images.

Dan Marino in action during the 1996 National Football League season. Photo by Allen Kee/WireImage.com.

Fran Tarkenton of the New York Giants. Photo by NFL/WireImage.com.

Johnny Unitas of the San Diego Chargers drops back to pass during the 1973 football season. Photo by NFL/WireImage.com.

Joe Montana recorded 273 career touchdown passes in 16 seasons in the NFL. (Photo by Al Messerschmidt/WireImage.com)

Terry Bradshaw of the Pittsburgh Steelers looks for an open man during the game against the Atlanta Falcons at Fulton County Stadium on November 1, 1981 in Atlanta, Georgia. The Steelers defeated the Falcons 34-20. Photo by Scott Cunningham/Getty Images.

Warren Moon of the Kansas City Chiefs gets ready to pass off the ball during the game against the St. Louis Rams at the Arrowhead Stadium in Kansas City, Missouri. The Chiefs defeated the Rams 54-34. Photo by Brian Bahr/Getty Images.