While celebrities all over the web have been dousing themselves with freezing cold water to raise awareness for ALS (Lou Gehrig's disease), 50 Cent has extended a special charity "ALS/ESL" challenge to Floyd Mayweather, and there's no ice needed.

Fif promises to donate $750,000 to whatever charity Mayweather chooses, so long as he's able to complete a reading exercise. The G-Unit MC posted a video on Instagram this morning explaining the rules. "If you can read one full page of a Harry Potter book, n---, I'll give $750,000 to whatever charitable organization you want," he says.

Sounds easy enough; however, there was one particular stipulation for the champ. He must read the popular fantasy novel "out loud without starting and stopping or f----- up."

At the very end of the video, 50  yells, "f--- the bucket of ice," and tosses it over his balcony. 

So will Mayweather expect the challenge? We'll have to wait and see. For now he's not responding, likely because 50 has been taunting him on social media for much of the day. 

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(Photos from left: Al Bello/Getty Images, Chris McKay/Getty Images)