"I brought fun by the gallon to our pal Jimmy Fallon," the "Gutfeld!" [and self-proclaimed king of late night] said on Friday night's monologue. "It went so well all the way home I could not stop talking about it with my Uber driver [displaying a picture of "Late Show" host Stephen Colbert.

Jimmy Fallon hosted an unexpected guest on Thursday’s (August 7) episode of The Tonight Show as rival late-night host and Fox News favorite Greg Gutfeld joined him on the sofa.

Jimmy Fallon joked and laughed his way through a Tonight Show interview with Fox News late-night rival Greg Gutfeld, who recently tried to reclaim the word “Nazi” as his own.