50 Cent is at it again. The long-standing feud between him and legendary boxer Floyd Mayweather, Jr. reached a fever pitch today with Power 105's 'The Breakfast Club' delivering the knockout blow.

It all started during Mayweather's interview with MLive, in which he attacks hip-hop artists' relevancy. While he never mentions 50 Cent or T.I.'s name, it's likely he's referring to both considering he has beef with them for various reasons.

"I'm relevant. I'm relevant... I'm something to talk about," he said. "What's so crazy is this: You know, when people are not relevant, and they're not moving units like they were once moving... you've got to realize, I've been relevant for 18 years."

This didn't sit well with 50 and he posted an Instagram video to clown Mayweather with a special ALS Ice Bucket Challenge.

"I will donate $750,000 to a charity of your choice, If you can read a full page out of a Harry Potter book out loud without starting and stopping or f---ing up. lmao,” he wrote in the caption.

It's been rumored that Mayweather can't read but it was further substantiated by 'The Breakfast Club' this morning (Aug. 22).

Charlamagne revealed that he had proof that Mayweather struggles to read. The radio host read a drop, which took him 10 seconds to read, but the same drop took Mayweather over two minutes. It's painful to hear.

While some might think it was funny, it made us very uncomfortable. Granted, 50 Cent has been hilariously clowning Mayweather for a while now but illiteracy is no laughing matter. It’s actually sad.

We don’t know where this is going to go next, but let’s hope that someone in Mayweather’s "Money Team" camp will persuade the legendary boxer to enroll in a reading/literacy program ASAP.