#4 Triple H's heat with CM Punk
It is a well-known rumor that Triple H and CM Punk never really got along. Bruce Prichard had revealed that Hunter was never really pleased with CM Punk and did not consider him to be a major deal.
He had also stated that Shawn Michaels and Triple H did not particularly like Punk and thought of him as 'unclean'. Triple H allegedly believed that the master of the GTS did not have 'it' in him and had too many attitude problems. Triple H had also referred to Punk as a 'waffle house cook'.
It is believed that one of the major reasons Punk had left before WrestleMania 30 was due to his disagreement over booking plans for a match against Triple H at the grand event.
#3 Jeff Hardy insults CM Punk
Jeff Hardy and CM Punk were not only on-screen rivals but harbored a deep-seated dislike for one another in real life as well. One of the stand-out incidents occurred when Jeff Hardy made a shoot video targeting Punk after Hardy had left WWE.
Not only did the former WWE Champion call Punk a "nerd' in the video, but he went on to rant about how he was responsible for making CM Punk a star. He also insinuated that his way of life is better than Punk's straight-edge lifestyle which prevents people from trying new things.