Earlier this season, the St. Louis Rams lost at Green Bay, 24-10. Three weeks later, the Rams beat the San Francisco 49ers, 27-6. Incredibly, that left the Rams' all-time series with both the Packers and 49ers tied, the former at 45-45-2 and the latter at 64-64-3.
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Among all head-to-head series between the NFL's current 32 teams, those are the two series that are currently tied with the most total games…by a gigantic margin. Until the Rams lost to Green Bay and beat San Fran, tying up series that have been going for a combined 143 years, the most oft-contested tied series in the NFL belonged to the Tampa Bay Buccaneers and Atlanta Falcons.