Famous Feuds. For anybody who thought the feud between Rosie O'Donnell and Donald Trump was a game all along, it's actually perfect for their careers.

"It was a great move," Sean Cassidy, president of the PR firm DKC, said. "They both have products to promote right now and one thing Trump knows better than anybody is that controversy sells. You need to be that much more intense to break through all of this online and tabloid chatter," he told Sunday Morning correspondent Martha Teichner.