There have been some classic skits on late night TV with Conan O'brien, especially when everyone's favorite foul mouthed K9 is involved, but this has got to be one of the best moments ever.

Triumph the Insult Comic Dog joined Jack McBrayer to visit the Weiner's Circle in Chicago last week. The hot dog stand is famous for four things: its signature Chicago-style hot dogs, hamburgers and cheese fries, and the mutual verbal abuse between the employees and the customers during the late-weekend hours when the establishment stays open as late as 5:00 AM, drawing many drunken customers who have arrived from bars and clubs.

Check out the video as Triumph lays out some brutally classic lines and McBrayer goes from renowned nice guy to an expletive speakin' , no nonsense takin', hot dog salesman.

Warning: Although the video below is censored, the language is vulgar.