The Cincinnati Bengals and Pittsburgh Steelers have become one of the most heated rivalries in the NFL over the past decade, and for good reason.
The Bengals-Steelers matchups have become knockdown, drag-out fights each time they play. There have been as many flags, penalties and fines lately as there have been brutal hits.
But the repercussions of the rivalry have extended beyond the AFC North division. It has actually changed the NFL, too.
A number of rule changes have been made in the past decade as a direct or indirect result of something that happened in a Bengals-Steelers game.