Look at what 50 Cent has started. A day after 50 challenged former friend Floyd Mayweather to "read one full page of a 'Harry Potter' book" for $750,000 to a charity of the boxer's choice, Power 105.1's "The Breakfast Club" released past audio of the undefeated champion struggling to read a drop.

"I'm Floyd Mayweather and I...I'm Floyd Mayweather and I've joined heart radio for the show...your stripes...okay...I'm Floyd Mayweather and I've joined heart radio for the show...your stripes movement to support hiring vets...I'm Floyd Mayweather and I've joined heart radio for the show, your stripes movement to support h...I'm Floyd...I'm Floyd Mayweather," a struggling Mayweather can be heard slowly getting through the drop after several false starts.

The audio badly suggests that there could have been truth in 50's jest and jabs toward the champ. After posting his initial Instagram video about Mayweather on Wednesday, Fif posed another challenge to "Money" later in the day, telling him that Jimmy Kimmel would be willing to have the boxer accept the challenge live on his late-night talk show. "We don't want to put pressure on you. We know you can't pronounce those words in that Harry Potter book, so we'll let you read Cat in The Hat."

Ah, man! Last month, Nelly, who's dating Mayweather's ex-fiancee, called the boxer a high school dropout.

Mayweather hasn't responded to 50's challenge yet. 

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(Photos from left: REUTERS/Danny Moloshok, Isaac Brekken/Getty Images)