By any standard, Jan. 25, 2013, began like any other for the thousands of traders, money managers and financiers making their way to Wall Street's canyons that morning, albeit with a snow-dusted commute — the first of the season.

But by 1 p.m., it wasn't the wintry weather topping the tape, but a public brawl so outrageous and audacious that few could believe what had just taken place. For the better part of the previous hour, investing titans Carl Icahn and Bill Ackman had hurled insults at each other on live TV – my CNBC program — bringing trading to a near standstill in what some would call the greatest moment in the history of financial television.