Amazon.com Inc.’s streaming coverage of the NFL’s Black Friday game between the champion Kansas City Chiefs and the Las Vegas Raiders drew an audience of 13.5 million viewers, a 41% increase from the company’s first such broadcast last year.

As the Las Vegas Raiders and Kansas City Chiefs meet for the NFL's "Black Friday" clash, memories from their most recent holiday matchup still linger. The Raiders' 20-14 upset win on Christmas was more than a surprise -- it was a pivotal moment that reshaped the Chiefs' road to the Super Bowl.

Why does the NFL have a "Black Friday" game in the first place? Money played a major factor, as Amazon missed an opportunity to broadcast a game on Thanksgiving in its $1 billion