#3 Hulk Hogan and The Ultimate Warrior (on-screen friendship)
Back in 1990, Hulk Hogan was still a major Superstar and a living legend in WWE, but another big name was steadily making his way to the top. The Ultimate Warrior was regularly getting big pops from the WWE Universe and many felt that he would be the one to replace Hogan as the face of the company.
At WrestleMania 6, Warrior defeated Hogan to win the WWE title and it seemed like WWE had ushered in a new era. Warrior's run as the face of the company didn't last as long as Hogan though, mainly due to several backstage differences between him and Vince McMahon.
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At one time, Warrior and Hogan were two of the most dominant forces in all of WWE and formed an alliance to take on Col. Mustafa, General Adnan, and Sgt. Slaughter at SummerSlam 1991. The duo defeated the villains to send the fans home happy.
Warrior and Hogan went on to berate each other on various occasions over the next two decades or so. Hogan was one of several Superstars who made fun of Warrior in "The Self Destruction of The Ultimate Warrior" DVD. Warrior bashed Hogan online on various occasions as well, but the two made amends during WrestleMania 30 weekend, even though Warrior didn't hesitate to let Hogan know that his words had hurt him a lot.