#2 Randy Orton at WrestleMania 31
Seth Rollins's WrestleMania debut as a singles competitor produced a fantastic, if too short, match against former Authority ally Randy Orton. Orton battled not just Seth Rollins, but also Rollins's security team in J&J Security (Jamie Noble and Joey Mercury), and forced the two retired cruiserweights to eat the "outta nowhere" finisher, among other signature moves.
A former WWE writer just went after JBL for his comments HERE
The match's defining moment, though, comes when Rollins sets up Orton for his Curb Stomp (now known as The Blackout), and the moment which helped make the RKO a meme with a life of its own was born: Orton stands up to launch Rollins skyward, and pulls him out of the air with an RKO which leaves the Levi's Stadium crowd (and millions watching at home) absolutely stunned.
It was the definition of WrestleMania spectacle: a match ending with an athletic display that few if any, performers could do; WWE front office staff reportedly doubted the pair's ability to pull off the move, and rehearsals beforehand gave producers fits.
It worked when it mattered.
Other Great Uses
At WrestleMania 27, Orton pulled CM Punk out of midair with an RKO to counter a springboard flying clothesline attempt; it spent four years as the Platonic ideal of the RKO Outta Nowhere until Orton and Rollins managed to top it.