According to Daniel Cormier, true UFC superfights have much in common with cartwheel kicks, flying knee knockouts or inverted rolling triangle chokes.
Everybody in mixed martial arts loves to talk about them. Plenty of people try to make them happen.
And almost nobody actually pulls them off.
Cormier and Stipe Miocic are getting it done Saturday night at UFC 226.
For only the third time in the UFC's 25-year history, a reigning champion will fight a reigning champion from another weight class.
Cormier (20-1), the affable light heavyweight champ, is moving up to challenge Miocic (18-2), the most accomplished heavyweight champion in UFC history, in the main event of the UFC's biggest pay-per-view show of the summer.
"This is the ultimate thing you can do in this sport," Cormier said.
"This is the chance for both of us to prove what we can do in unique circumstances.
"Everybody wants to see this kind of fight but nobody ever actually takes the risk and does it. So let's do it."
After the T-Mobile Arena cage door finally closes on this long-anticipated bout, both fighters agree we'll finally know the identity of the biggest, baddest man in MMA.
"I know what he's capable of doing, but it's nothing that scares me," Miocic said.
"Of course it's great to get the opportunity to find out whether you're better than another champion, because I respect Daniel a lot, and I know he respects me.
"This is the kind of fight you always wonder about."
The UFC's annual International Fight Week show in its hometown also includes a tantalising heavyweight match-up between sluggers Derrick Lewis and Francis Ngannou.
Max Holloway was scheduled to defend his title against Brian Ortega but the featherweight champion dropped out Wednesday night with symptoms of concussion.
Cormier has spent the past five years fighting at the light heavyweight limit of 205 pounds but the size disparity between Miocic and Cormier is only in height and reach.
Cormier is at least five inches shorter than the 6-foot-4 Miocic, who has a whopping 8-inch reach advantage.
But when they stepped on the scales Friday morning, Cormier (246 pounds) actually outweighed Miocic (242.5).
"Not having to cut any weight is very pleasant," Cormier said with a laugh.
Cormier fought extensively at heavyweight earlier in his career.
He won the Strikeforce title and never lost a single round at heavyweight.
