A Washington Redskins flag is waved prior to the NFC Wild Card Playoff Game against the Seattle Seahawks at FedExField in January. Al Bello/Getty Images hide caption

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Randy Moss of the 49ers glides down the field, under an arcing football, on his way to a touchdown against the Patriots on December 16, 2012. Jared Wickerham/Getty Images hide caption

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The brain of former NFL star Junior Seau, who committed suicide last year, showed signs of the kind of neurodegenerative disease associated with repetitive head trauma. Elsa/Getty Images hide caption

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Junior Seau, seen here playing for the New England Patriots toward the end of his career, suffered from a degenerative brain disease, scientists say. Otto Greule Jr./Getty Images hide caption

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Junior Seau, seen here playing for the New England Patriots toward the end of his career, suffered from a degenerative brain disease, scientists say. Otto Greule Jr./Getty Images hide caption

itoggle caption Otto Greule Jr./Getty Images

Andy Reid as he left the field Sunday in New Jersey. His last game as head coach of the Philadelphia Eagles was a 42-7 loss to the New York Giants. Elsa/Getty Images hide caption

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They'll be welcomed back by fans: Regular NFL refs will be on the job again starting tonight. (2006 file photo.) Shaun Best/Reuters /Landov hide caption

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A spoof site launched by Erik Johnson pretends to offer Google's search engine — if it were run by replacements. Replacement Google hide caption

itoggle caption Replacement Google

Things haven't been going well for these guys: Some of the NFL's replacement referees, during a Sept. 23 game between the New England Patriots and Baltimore Ravens. Kevin Dietsch /UPI /Landov hide caption

itoggle caption Kevin Dietsch /UPI /Landov

Confusion: One official (to the left) signals touchdown for Seattle. The other signals that a touchback — possession — for Green Bay. Stephen Brashear/AP hide caption

itoggle caption Stephen Brashear/AP