10. The Undertaker Vs. Mankind - WWF King Of The Ring 1998
Mick Foley, as Cactus Jack, had long been in the business of using real-life violence to get himself over.
At Clash Of The Champions X in 1990, Foley was tasked with wrestling Mil Mascaras - a performer so selfish that he infamously eliminated himself in the 1997 Royal Rumble match. He was happier to make himself look stupid than make somebody else look good at his expense. Knowing that Mascaras was giving him nothing, Jack made the match memorable by careening off the apron and smashing the back of his skull onto the exposed concrete below. The man was so dedicated to his art that he risked serious injury in the match, the failure of which nobody would have blamed him for.
As Mankind, he took two more psychotic bumps in his 1998 King Of The Ring Hell In A Cell bout with the Undertaker. Falling off and through the Cell, Foley had succeeded in his mission to equalise Shawn Michaels' workrate a few months prior through sheer spectacle. It was an infuriating transgression of wrestling logic to many old school minds. Foley had raised the bar by intentionally destroying himself.
Ultimately, he did not break the more sacred tenet of endangering his opponent. His artistic choice was his own; thankfully, only he is qualified to answer the question.