Denver Broncos quarterback Tim Tebow #15 throwing the football during the American Football Conference Divisional Playoff game between the Denver Broncos and the New England Patriots on Saturday, January 14 2012, at Gillette Stadium, Foxborough, Massachusetts. The Patriots beat the Broncos 45-10. (AP Photo/David Drapkin)

San Francisco 49ers quarterback Steve Young passes for a gain in the first quarter against the Carolina Panthers on Sunday, Nov. 16, 1997, in San Francisco. The 49ers clinched the NFC West for a playoff berth with their 27-19 victory. (AP Photo/Susan Ragan)

Miami Dolphins Scott Mitchell (19) looks to pass during first quarter action against the Indianapolis Colts in Miami, Oct. 24, 1993. Mitchell is the Dolphins' new starting quarterback after Dan Marino was injured and forced out for the rest of the season. (AP Photo/Marta Lavandier)

Cleveland Browns quarterback Paul McDonald (16) throws a pass on the run during the Browns 20-17 loss to the Los Angeles Rams on September 9, 1984 at Anaheim Stadium in Anaheim, California. (AP Photo/NFL Photos)

New York Jets quarterback Michael Vick (1) in action during a preseason football game against the Indianapolis Colts on August 7, 2014 in East Rutherford, New Jersey (AP Photo/Evan Pinkus)

Quarterback Mark Brunell #8 of the Washington Redskins throws a pass against the Indianapolis Colts at the RCA Dome on October 22, 2006 in Indianapolis, Indiana. The Colts beat the Redskins 36-22. (AP Photo/David Stluka)

Oakland Raiders quarterback Ken Stabler (12) throws a pass during an NFL game against the Seattle Seahawks in Oakland, 1970s. (AP Photo/Arthur Anderson)

Seattle Seahawks quarterback Jim Zorn throws a pass to one of his receivers as San Francisco 49ers defensive end Fred Dean attempts to block the pass during the first half of action at Candlestick Park in San Francisco, Aug. 27, 1983. (AP Photo/Paul Sakuma)

Cincinnati Bengals quarterback Boomer Esiason (7) sets up to pass during game against the Los Angeles Rams at Anaheim, Oct. 7, 1990. The Bengals defeated the Rams 34-31 in overtime. (AP Photo/NFL Photos)

New Orleans Saints quarterback Bobby Douglass (10) sets up to pass behind center John Hill (62) during an NFL game against the Green Bay Packers, Nov. 7, 1976. The Packers defeated the Saints 32-27 at Milwaukee County Stadium. (AP Photo/Vernon Biever)