Charles Barkley and Shaquille O'Neal have developed a nice rivalry over the years and it came to a head once again last week during CBS Sports' March Madness coverage. During halftime, Shaq tweeted an insult at Sir Charles. Since Barkley had the platform of a nationally-televised broadcast, he fired back and had his fellow commentators cracking up. At one point, he even said that a cream soda that Shaq endorses is "spreading diabetes all across the world". Brilliant!