First, Heat center Shaquille O'Neal took a shot at Kobe Bryant in the lyrics of his latest rap album. Now he's taking on the Lakers general manager who traded him.

"Some guys are so smart that they're dumb," O'Neal told SLAM Magazine. "Mitch Kupchak will never be remembered for anything but what? Trading me. That was the dumbest move in sports history. Congratulations, Mitch."

On Monday, O'Neal began working out with Heat teammates at AmericanAirlines Arena and looked impressive, according to a source.