Jeff Hardy vs. CM Punk remains a memorable feud in recent WWE history, with its relentless twists and turns producing a sublime rivalry that dominated SmackDown's summer of 2009.
While Hardy and Punk both featured in WrestleMania 23's Money in the Bank Ladder match, their fleeting interaction was minimal, and it wasn't until 2009 that any seeds of discontent were actually sown.
Granted, this was a fairly short rivalry, but the quality of the writing and the performances of Hardy and Punk made it feel more like an HBO mini-series than a pro wrestling rivalry.
It was also the feud that turned CM Punk into a star.
Following three years as an upper-mid card babyface, Punk's first foray into life on the dark side began with wonderful originality as he cashed in his Money in the Bank contract on Hardy at Extreme Rules.
Having just obtained the World Heavyweight title in a ladder match from Edge, the notion of his cash-in was viewed critically by the WWE Universe. Previously, a face had yet to cash in on another face.
From then on, the feud proved a delight to watch each week, with Hardy eventually recapturing the strap from Punk at Night of Champions before his fully fledged heel turn kicked into gear.
With Hardy's contract set to expire following the culmination of the feud, WWE added a lovely, nostalgic touch by finally resolving his issues with brother Matt, who he had spent most of the year feuding with.
The rivalry ended up producing one of the best matches of the year, as a sensational Tables, Ladders and Chairs battle at SummerSlam saw Punk reclaim the gold once again.
In their final bout, Punk sent Hardy packing from WWE inside a steel cage, concluding a superb rivalry that elevated men both to superstar status in the pro wrestling world.