UFC and WWE are two separate entities. One is a mixed martial arts organization. The other is a pro wrestling (sports entertainment!) promotion. Their paths rarely, if ever, cross. But when it does, usually it's a good thing for both outfits. 

The latest example of this is the possibility of a UFC fight between Jon Jones, who won the UFC light heavyweight championship Saturday, and Brock Lesnar, a former UFC heavyweight champion who is currently a part-time WWE superstar. (Lesnar is WWE's current universal champion.) 

After his UFC 214 fight Saturday, Jones called out Lesnar. Lesnar's response: "Be careful what you wish for, young man."

The potential UFC superfight is already an exciting proposition. But there is another layer to this. And that's where WWE enters the picture. 

Lesnar is defending the WWE Universal Championship at Summerslam later this month. On Monday Night Raw, his manager Paul Heyman announced that the dynamic duo would leave WWE if Lesnar loses the universal title at Summerslam. 

On paper, there's a good chance Lesnar will lose at Summerslam. He is in a Fatal 4 Way match against Samoa Joe, Roman Reigns and Braun Strowman. Of course, WWE is scripted. But the three opponents are some of WWE's biggest bodies around. Lesnar is a monster, too. Summerslam won't be easy for him. 

There's still a chance for Lesnar, though. There has been speculation that WWE will keep the title on him until WrestleMania 34, which is around the time his contract expires. A Lesnar-Reigns match could be in the cards. Having a part-timer hold the title for that long isn't ideal for WWE, but anything can happen. 

But back to Heyman's announcement on Raw. There is something about it that makes you wonder about potential storylines and how WWE could execute a big surprise. After all, former UFC champion Ronda Rousey's role at WrestleMania 31 shocked fans. Why couldn't WWE pull it off again?

If Lesnar is going to lose at Summerslam, why not do it in a way that allows him time to prepare for a potential UFC fight and produces a great story? 

Enter Jones. 

Picture it: Lesnar is on the verge of winning his Fatal 4 Way match at Summerslam. And out comes Jones! He could merely distract Lesnar. He could get physical. Either way, Jones costing Lesnar the title at Summerslam would be a coup for WWE — and it could heat up the possibility of a UFC fight between the two. 

It's a long shot. Jones will likely want a decent cut from WWE to appear. UFC (probably) has to sign off on it. Will UFC President Dana White go for it? Can WWE Chairman and CEO Vince McMahon seal the deal?

If it happens, it will be one of the biggest Summerslam moments in years. It will serve another purpose, too. It will mean that a UFC fight between Jones and Lesnar is all but final. It will happen. It won't be a matter of if, but when.