Randy Orton had said he wasn't going to choose to fight Triple H at WrestleMania, until Trips reminded him of how he was responsible for kicking him out of Evolution, and making him lose his first World Heavyweight Championship.
Because of this, Orton changed his mind and declared that at WrestleMania 25 he would take on Triple H for the WWE Championship.
In the weeks that followed, we witnessed Triple H break into Randy's house, beat him down and throw him through a window.
Hunter also took a sledge hammer to both Cody Rhodes and Ted DiBiase inside a steel cage, as Orton walked up the ramp with his tail firmly between his legs.
Orton, however, sought revenge and got it once Legacy handcuffed Triple H to the ropes and brought Stephanie out.
She pleaded that Randy not hurt her husband, but he just kicked her in the gut, hit his elevated DDT and sealed it with a kiss.
Triple H was steaming at the sequence of events that had just happened before his very eyes, but he could do nothing about it.
Why It Worked:
All these things were necessary to make this storyline great and they were explained very well.
Randy didn't want to face Triple H because he was scared of him. But once Triple H reminded him of their history, Orton's disorder didn't allow him to pass on the opportunity.
Triple H then gained the upper hand with sacrifices The Viper was "willing to make" so that he could take advantage of H's guard being down (and he did so when he DDT'ed and kissed Stephanie, all while Triple H was watching).