Courtesy of WWE.com:
The 25 Most Personal Grudges in History
Gritty. Visceral. Personal. These words only begin to describe the 25 rivalries that follow. Sure, these grudges have given way to all-time great matches, and often, they were fought with championship gold on the line. But make no mistake about it: The five-star classics were simply a byproduct of hate. The Superstars involved in these grudges weren’t out to impress fans or upper management, and they had no interest in putting on wrestling clinics. No, they were out for retribution, and to settle unfinished business. They were out to inflict pain, to shorten careers.