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December 18th, 2011: The Kansas City Chiefs upset the 11-0 Green Bay Packers in Arrowhead #Chiefs...

By Back Then Sports

Posted December 21, 2025

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About the Creator

Back Then Sports is a Twitter account dedicated to sharing memorable moments and stories from sports history. They often post about significant games, milestones, and anniversaries, providing a nostalgic look back at the world of sports. Their content is generally factual and aims to evoke memories and spark discussions among sports fans.

What's This About?

The tweet highlights the Kansas City Chiefs' unexpected victory over the previously undefeated Green Bay Packers on December 18th, 2011. The Packers entered the game with an 11-0 record and were considered Super Bowl favorites, making the Chiefs' win a major upset. This game is remembered as a significant moment for the Chiefs and a rare blemish on the Packers' otherwise dominant season. It's a reminder that anything can happen in the NFL.

🔥Why It's Trending

This content is likely trending due to the anniversary of the game (December 18th). Anniversaries often trigger nostalgic posts and discussions on social media, leading to increased engagement and visibility. It could also be resurfacing due to current NFL standings or discussions about undefeated teams and potential upsets.

💡Fun Facts

1The Packers' only other loss in the 2011 regular season came in Week 17 against the Detroit Lions, after they had already secured the #1 seed in the NFC.
2The Chiefs were 5-8 entering the game against the Packers.
3Aaron Rodgers had a passer rating of only 78.5 in the game, significantly below his season average.
4The Chiefs won 19-14 due to a strong defensive performance and efficient running game.
5Matt Cassel was the Chiefs' starting quarterback at the time.