#4 Shane McMahon Vs. A World Champion
Shane McMahon is possibly the most-loved of all the McMahon clan, and is certainly more accepted by the fans than his father Vince, or daughter Stephanie.
But there have been rare instances of Shane-O-Mac teasing a heel turn, most recently with his victory of the Best in the World trophy at Crown Jewel.
If the WWE were willing, the company could push the button on McMahon, turning him a fully-fledged heel with the power to book himself in title matches.
With power over the referees, outside interference and even timekeeper, McMahon definitely has the means to become World Champion, if the WWE want to go down this route.
The issue here is that McMahon's history of entertaining the crowd makes it very difficult to boo him, even if he was to try to elicit such a reaction.