Movie or television sets can be hostile places if the stars don't get along. Although they have to be professional on camera, these co-stars have sworn to never work together again.
1. 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."