This is actually happening!
Bill Ackman is the "mystery guest" at CNBC's Delivering Alpha Conference. He's on stage right now with Carl Icahn.
It's been over a year since the two fund managers were involved in a nasty public fight live on CNBC. While Ackman was was responding to Icahn's criticism of his Herbalife investment, Icahn called into the "Half Time Report" and the insults were flying.
"I'm telling you he's like a crybaby in the schoolyard. I went to a tough school in Queens you know and they used to beat up the little Jewish boys. He was like one of the little Jewish boys crying that the world is taking advantage of him…" Icahn said when Ackman called him up in 2003, adding "You rue the day I ever met the guy."
"He's the quintessential example of if you want a friend on Wall Street, get a dog," Icahn later said.
It looks like the tables have turned. They have both said that they "respect" each other.