17. Kiefer Sutherland & Freddie Prinze, Jr.
The unlikely duo costarred in Sutherland’s smash hit TV series “24,” but that doesn’t mean they had to like each other. “I did ’24’; it was terrible. I hated every moment of it,” Prinze said. “Kiefer was the most unprofessional dude in the world. That’s not me talking trash—I’d say it to his face. I think everyone that’s worked with him has said that.”
