#7 Hulk Hogan turns "Hollywood" (Bash at the Beach - July 7, 1996)
Game changer.
That was what occurred at WCW's 1996 Bash at the Beach pay per view event.
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The show was main evented by a Six-Man Tag Team encounter between the WCW team of Macho Man Randy Savage, Lex Luger and Sting versus The Outsiders, Hall, Nash and a mystery partner. As the match wore on however, the mystery partner never showed until the climax of the bout, when Hulk Hogan appeared, apparently to assist his WCW colleagues, but instead leg dropped his buddy, Savage repeatedly.
Hogan was the third man and cut a passionate post-match promo in which he trashed WCW and it's fans and christened the upstart invaders as the New World Order.
It is impossible to explain how much of a seismic shock this was in 1996, with Hogan turning heel for the first time since 1981. Think, John Cena turning heel in 2011 as a comparable modern day example, only much bigger.
This invigorated Hogan's declining career and catapulted WCW to new heights and set up several years of incredibly dynamic programming.