On May 4, World Wrestling Entertainment will present its annual Extreme Rules pay-per-view from the Izod Center in East Rutherford, New Jersey. Throughout the six years of the event's existence, it has produced some truly memorable matches and moments featuring some of the top stars in the industry. They are moments that left fans' jaws dropped and matches that have stood the test of time. Whether it was the breathtaking main event between Jeff Hardy and Edge that headlined the inaugural 2009 event or the debut of Kharma two years later, the brutal war between Brock Lesnar and John Cena in 2012 or the heavyweight title dreams of Christian coming to fruition, the show has left an indelible mark on fans across the globe. On May 4, WWE will present the 2014 edition of the show, headlined by a huge six-man tag team clash pitting The Shield against Evolution. With Daniel Bryan defending his WWE World Heavyweight Championship in an Extreme Rules match against the Big Red Monster Kane, the potential is there for this year's show to produce more matches and moments that live on forever. In preparation for the upcoming event, relive these 10 greatest moments from Extreme Rules history.