Their storyline and rivalry started when Rey Mysterio pinned CM Punk to eliminate him from the Elimination Chamber match at the self-titled event in 2010.
The following SmackDown, Mysterio interfered on behalf of Shelton Benjamin, pulling Gallows of the apron who was trying to help CM Punk win the match.
This cost CM Punk the chance to qualify for the Money in the Bank match at WrestleMania 26.
The following week, CM Punk and the Straight Edge Society spoke in the ring about Mysterio. What happened next lit the fuse in their rivalry.