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.
Faye Dunaway v. Roman Polanski
This iconic actress and iconic director sparked a feud on the set of the classic film "Chinatown" that is a part of Hollywood legend. The feud began when Polanski plucked a troublesome hair from Dunaway's head, and then when she asked him for her character's motivation he told her to "just say the f-ing words, your salary is your motivation." The feud reached its pinnacle when Polanski wouldn't let her go to bathroom, so she threw a cup of her urine into his face.
Will Smith v. Aunt Viv
Actress Janet Hubert who played Aunt Viv on the show "Fresh Prince of Bel Air" was not fond of Will Smith at all, considering him an egomaniac. Will instead thought that she wanted the show to be more like "Aunt Viv of Bel Air." Regardless of who was right, the producers ended up replacing Hubert due to the fight and money reasons.
William Shatner v. George Takei
These two have been fighting with each other ever since they worked together on the set of "Star Trek" way back in the 60's. They are both still famous and involved with internet culture today which has only served to add fuel to the fire. Through interviews, tweets, videos, and reddit posts these two call each other names like no other.
Robert Downey Jr. v. Terrence Howard
Terrence Howard famously reported that Robert Downey Jr. actively worked to push Terrence out of his role that he originally played in Iron Man 1. Allegedly, Terrence was offered a significantly reduced salary for Iron Man 2 despite his contract for the film, and when he wouldn't take it he was kicked from the film, all while Robert's salary increased dramatically.
Shannen Doherty v. Alyssa Milano
Milano refuses to ever work with Doherty again, citing extreme difficulties during the making of "Charmed." Milano compared the controversy on set to the drama you would typically find in high school.
James Franco v. Tyrese Gibson
These two actors were supposed to be rivals in the film, but their fight scenes ended up becoming real. After filming this movie, Tyrese was furious with Franco, saying "I never want to work with him again … It felt very personal. It was ****ed up." Franco admits he probably got way too into his role and got carried away.
Sylvester Stallone v. Richard Gere
Way back in 1974, Stallone and Gere were working on a film together. They never hit it off, and at one point Gere supposedly intentionally dropped chicken grease all over Stallone resulting in Stallone elbowing him in the head. Stallone also possibly started an urban legend about Gere regarding a gerbil and his sexual behavior.
Harrison Ford v. Josh Hartnett
Ford is known for being a bit stand-off-ish, fighting with people like George Lucas and Shia LeBeouf. However, Ford developed a particularly bad relationship with Josh Hartnett when they were supposed to be co-stars of the film "Hollywood Homicide." Hartnett's perspective is prety funny, saying ""there were times we would end up just sitting in the car when we were supposed to be doing a scene and neither of us would say anything for like an hour."
Wesley Snipes v. Blade: Trinity Cast
Wesley Snipes is a crazy, crazy dude who was very difficult to work with when he was practicing method acting for "Blade: Trinity." Ryan Reynolds was essentially fighting with Snipes in real life as well as in the movie, since Snipes would only really come out of his trailer for close-up scenes. Snipes went so far as to ask his director to quit when he behaved in way that made Snipes uncomfortable.
William Baldwin v. Sharon Stone
These two were supposed to be lovers in the movie "Sliver," but their tension off-screen caused the romance (and the movie as a whole) to flop. Sharon supposedly bit Baldwin's tongue so hard that he was rendered unable to speak normally for days.
Bill Murray v. Lucy Liu
Bill backed off of the "Charlie's Angels" movie series due to a fight that he had with actress Lucy Liu. While on set, Bill made a point of questioning why Lucy was cast for her role, directly calling out her acting ability. Bill is notoriously rude to those whose talents he doesn't respect.
Nick Nolte v. Julia Roberts
The movie "I Love Trouble" fell flat when costars Julia Roberts and Nick Nolte did not hit it off at all. Ten years after the filming of the movie, Roberts called him "a disgusting human being," with Nolte retaliating by saying she was simply "not a nice person."