"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.

Greg Gutfeld made his broadcast late-night debut on “The Tonight Show Starring Jimmy Fallon” Thursday evening, marking a rare network crossover with the Fox News host visiting NBC’s 30 Rock. A conservative media personality is a rare booking for “The Tonight Show” and the 10-minute segment between Gutfeld and Fallon largely steered clear of politics.

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.