Rapper,50 Cent is back at it again.This time,he is taking a jab at his former friend(now turned foe)champion boxer,Floyd Mayweather. The rapper posted a video asking Mayweather to take part in a challenge except it doesn't involve a bucket of ice, or even the ALS Foundation. "This is a special ALS/ELS challenge for you Floyd," the hip hop star said. "If you could read one full page of a 'Harry Potter' book ... I'll give $750,000 to whatever charitable organization you want to." "F--- the bucket of ice, man," he concluded the clip, which shows his throwing a bucket of ice towards his backyard.I think 50 should save it and give us hits like he used to.First,T.I,now 50 cent.When did Floyd the boxer become less threatening?