9. Mr. McMahon vs. Big Show, Undertaker, Kane, The Rock & Mankind In A Six-Pack Challenge (Unforgiven 1999) - WWF Title
http://www.dailymotion.com/video/xnok8_wwe-unforgiven-1999_sport On the September 16, 1999 edition of WWF Smackdown, Mr. McMahon "achieved the impossible" and defeated Triple H for the WWF Championship. Thus, the six-pack challenge announced with non-wrestler McMahon in the ring with five other competitors made sense on one level. However, prior to the match, The Undertaker injured his groin and was written out of storylines via being fired for not wrestling Triple H in a casket match when commanded to do so by evil Mr. McMahon.
However, by the September 23rd edition of Smackdown, Vince himself had vacated the WWF Championship, the match being switched to a six-pack challenge featuring Big Show, Kane, The Rock, Mankind, a returning British Bulldog and the eventual winner, Triple H. A prime example of the insanely frenetic pace of booking in the Attitude Era, a man not even initially advertised in a Championship match became WWF Champion in a title match.