Floyd Mayweather is making fun of a rumor that he and rapper 50 Cent got into a fist fight over money. According to reports, the men came to blows over the weekend when Mayweather refused to pay Fiddy $10,000 after losing a bet on a boxing match.

The Jamaican Queens rapper allegedly took exception to the boxing champ’s reluctance to pay him, which led to a scuffle.

And while there’s no confirmation this fight actually happened, Floyd clearly has caught wind of the rumor, and took to Twitter to poke fun at it:

“Round 2: Me and @50Cent getting it on over some stacks,” he wrote, adding this picture:

If Pacquiao and Mayweather never square off, these two might make for an interesting main event.