During the New Yorker Festival in New York City Saturday, the Hangover star revealed that the 42-year-old actress wasn't keen on his idea to use a Pitt look-alike for his Between Two Ferns comedy segment on Funny or Die.
"I had found this guy [in our hotel] who looked exactly like Brad Pitt. I wanted to use that in some way," Galifianakis, 42, recalled. "I said, 'Jennifer, I have this guy who looks like Brad Pitt. I want to make it seem like I think it's him.'"
"She looked at me like, 'What the f--k?'" an embarrassed Galifianakis admitted. "And I totally agreed with her. How rude of me to do that! Why would she want to talk about that? She get inundated with that sh-t all the time. I totally understood."
A dejected Galifianakis then met with the look-alike to "tell him sorry that we couldn't do the bit."
"People are pretty game, usually," Galifianakis said of his guests on Between Two Ferns. "It's a fun, stupid thing to do."
After Aniston nixed his original idea, Galifianakis enlisted former MTV reality star Tila Tequila, 29, to appear in the skit. During the four-minute clip, Galifianakis made it clear that he favored Tequila, prompting Aniston to (jokingly) storm off.