In fact, the 20-18 loss the 49ers suffered on Jan. 9, 1999 turned out to be a certifiable nightmare that had lasting repercussions for the franchise.

Relive Kurt Warner's 5-TD game vs. 49ers in 1999 | NFL Throwback Ahead of their Week 8 matchup, watch highlights from the Rams 42-20 win over the 49ers in Week 5 of the 1999 season.

In this upside-down, topsy-turvy NFL season, the Rams finally turned the 49ers' on their heads. Quarterback Kurt Warner continued his amazing run, throwing for 323 yards and five touchdowns Sunday.