The Green Bay Packers and the Minnesota Vikings—though several examples rank ahead of the hated NFC Norris rivals, it's a bitter back-and-forth that showcases deep-seeded roots throughout NFL history.

A perfect case and point comes when Brett Favre literally jumped to the New York Jets for a season prior to ending up with the team he knew he wanted all along in the Vikings. Now, Favre to the Vikings has been officially voted as the most shocking free-agent signing in NFL history, via Nick Toney of NFL.com.

Favre, 48, was a ripe 39 years of age when he made the jump to Minny amid extremely hard feelings between him and the organization.

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After a Pro Bowl season in 2007 that ended in the NFC title game against the New York Giants, the Packers announced that Aaron Rodgers was their man moving forward. He couldn't sign with whomever he wanted, so, accepted a trade to the Jets. One year later, Brett Favre was Skol bound.

The free agent signings that rank below Favre-t0-Vikings are Deion Sanders to the San Francisco 49ers (1994), Curtis Martin to the Jets (1998), Reggie White to the Green Bay Packers, Albert Haynesworth to the Washington Redskins, Peyton Manning to the Denver Broncos, Jerry Rice to the Oakland Raiders, Deion Sanders (again) to the Redskins, Rod Woodson to the Baltimore Ravens and Kirk Cousins to the Vikings.

The two honorable mentions of the list are Darrelle Revis to the New England Patriots and Marcus Allen to the Kansas City Chiefs.

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