Why is the NFL America's favorite league?
The game-day pageantry, over-the-top personalities, breathtaking athleticism, and hotly-debated strategies are all important variables.
But at its essence, football is a violent game. Fans want to see bone-jarring hits that leave players dazed and defenses in a frenzy.
While each game has its share of brutal collisions, there are occasionally some that make fans rewind their DVR and upload them to YouTube.
Here are the top 10 earth-shattering collisions.