Watch: Louis CK crashes Brad Pitt's hilariously awkward 'Between Two Ferns' interview

In a hilarious turn, Brad Pitt appeared on Zach Galifianakis's send-up interview show 'Between Two Ferns,' and true to form, the host hurled one insulting question after another at Pitt (or Bradley Pitts, as Galifiniakis introduced him.)

In the middle of this excruciatingly squirmy chat, Louis CK barged in to "liven things up," and provide some comic relief.

"I saw a rat on the subway, and I didn't know if it was Ebola or ISIS," the comedian said.

Galifiniakis turned to Pitt, and asked: "Do you think your looks get in the way of people realizing that you're just a shitty actor."

Funny. Watch: