Holy moly, CNBC just had its most memorable segment in years.

Pershing Square Capital CEO Bill Ackman was on CNBC’s “Fast Money” responding to comments made by fellow billionaire investor Carl Icahn. The two have a feud going back more than 10 years.

Well wouldn’t you know it, Icahn called into the show, fireworks ensued, and the viewers were the real winners. Along the way Icahn dropped a few words that were not exactly family-friendly. Anchor Scott Wapner did his best to try and keep the peace.

WATCH: