Kiefer Sutherland is such a terror to work with, Freddie Prinze Jr. almost quit acting over the "24" star's "unprofessional" behavior.
"I did '24,' it was terrible. I hated every moment of it," Prinze revealed. "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."