FLOYD Mayweather Jr., sure knows when to butt in.

So that while Manny Pacquiao has become hot news again, haven’t you noticed Mayweather’s reentry into the spotlight, too?

If Mayweather could sneak in a jab in a blur, he could also grab a piece of any action anytime he wants to.

Pacquiao versus obscure Jeff Horn is now gym talk worldwide, as viral as Trump’s insistence on building that “Great Wall” aimed at blocking Mexico’s illegal entrants into US territories.

While being adept himself at snatching that record-equaling 49-0 mark, Mayweather has also proven himself as an expert in scene-stealing.

Look, how do you call his rankling rant that Conor McGregor knows nothing about boxing?

That wasn’t just a terse tease but an astute attempt at drumming up interest in a planned Mayweather-McGregor clash.

And what if Mayweather would so quickly contradict himself by saying McGregor wouldn’t make a good match against him?

“He is good for $15 million when he finally fights me,” said Mayweather, who retired after beating an unhealthy Manny Pacquiao by unanimous decision in 2015.

McGregor, 28, a champ at UFC (Ultimate Fighting Championship), has some big-mouth stuff of his own when he said he is “good for $100 million” against Mayweather.

Surely, he also knows how to pick up the cue from Mayweather, who is arguably the best promoter of everything not believable in the fighting business.

Said Mayweather, now 39, to the McGregor camp: “$15 million is enough for him, plus PPV [Pay-Per-View] revenues. They know what my number is. My number is a guaranteed $100 million. That was my number.”

If you think money-eyed promoters wouldn’t bite, think again.

Didn’t the late Muhammad Ali “fight” a towering, 7-footish non-boxer, mock the odds and then proceeded to successfully get away with crime?

To “fight” that skyscraper giant, Ali “fought” lying down on the canvas.

Because Ali was at the height of his career, he passed the test with flying colors.

Now, if and when the Mayweather-McGregor bout pushes through and Mayweather will try to mimic Ali’s gimmick, don’t be surprised.

How many times have I said here that boxing, like politics, is the art of the possible?