Mariah Carey v. Nicki Minaj
American Idol, normally meant to focus on the talents of new singers, instead recently saw the outbreak of a nasty feud between Mariah Carey and Nicki Minaj. Mariah said it was "like going to work every day in hell with Satan." Minaj at one point said "I'm not ****in' putting up with her ****in' highness over there."
Bruce Willis v. Kevin Smith
The two worked together on the movie "Cop Out," and it was apparently a terrible time for both of them. Smith has said that Willis was very difficult and made the process soul-crushing for him, and Willis called Smith a "whiner."
Jamie Foxx v. LL Cool J
Jamie Foxx and LL Cool J had a horrible experience on the set of "Any Given Sunday." LL Cool J, who is a method actor, continued to beat up Foxx even after the director called cut on a fight scene. Foxx filed assault charges, and LL defended himself to the police by specifying that it was the character who was fighting, not him.