#7 John Cena & Bret Hart vs Vince McMahon & Batista - WrestleMania 26

WrestleMania 26 saw John Cena challenge Batista for the WWE Championship and Bret Hart compete in his first WWE match since Survivor Series 1997 in a dream match of sorts, a No Holds Barred match with Vince McMahon. But these two matches were actually a plan B.
Up until very late February, the plan was to combine these two matches into a tag team match, John Cena and Bret Hart vs Vince McMahon and Batista, and the WWE Championship would have still been on the line.
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In fact, some sources even claim that at one point, the plan was to have whoever scored the pin fall be Champion, ala' David Arquette's WCW Championship win, and to have Bret Hart win his 6th WWE Championship!
Ultimately WWE changed their minds, which is unfortunate as it likely would have been better than Vince vs Bret and even possibly Cena vs Batista.