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You can't expect every actor to become best friends with their co-stars, but most actors at least maintain a professional level of courtesy toward their on-screen counterparts.

Unfortunately, the same can't be said of these actors and actresses who took behind-the-scenes feuds to new heights.

Charlie Sheen and Selma Blair According to TMZ, things got so tense between Anger Management co-stars Charlie Sheen and Selma Blair that Blair threatened to sue Sheen and Lionsgate Entertainment. The source alleged that Sheen had Blair kicked off the series after she criticized him for not learning his lines. This prompted her to threaten Sheen and Lionsgate Entertainment with a lawsuit seeking the $million she would have made had she stayed on. Sources for TMZ claimed that Blair was always going to be written off the show, because "America didn't want to see Charlie with just one girlfriend." Whatever the case, don't expect these two to send each other holiday cards anytime soon.

Robert Shaw and Richard Dreyfuss Much like the characters they played, actors Robert Shaw and Richard Dreyfuss didn't get along during much of the shooting of Jaws. What caused the feud? According to co-star Roy Scheider, Shaw didn't like Dreyfuss' pompous attitude about filming the movie. "Dreyfuss would say 'What am I doing shooting on this island? Why am I here? I should be signing autographs at Sardi's.'" Eventually, their feud reached a boiling point when Dreyfuss supposedly threw a glass of bourbon that Shaw had been drinking out the window. "That was the shot heard around the world. It got ugly. It got ugly." According to the documentary In the Teeth of Jaws, the duo eventually made amends during the filming of Quint's famous USS Indianapolis speech — again, just like their characters.

The Rock and Vin Diesel Dwayne "The Rock" Johnson shocked everyone in 2016 when he posted a blistering rant on social media calling out some of his male co-stars for their poor work ethic on the set of The Fate of the Furious. "Some conduct themselves as stand up men and true professionals, while others don't. The ones that don't are too chicken s--- to do anything about it anyway." TMZ later alleged that Johnson was referring to his co-star Vin Diesel, launching a whole bunch of he-said, he-said reports. In one particular case, sources for TMZ alleged Johnson had grown tired of Diesel's attitude on set and his penchant for showing up late. Although their feud probably made for an awkward press tour, Diesel and Johnson reportedly buried the hatchet within days of the film's theatrical release and will both continue to appear in the franchise. Good luck with that!

Nathan Fillion and Stana Katic Fans of the long-running ABC drama Castle were shocked in April 2016 when news broke that Stana Katic had been let go from the show after eight seasons. Why did the series get rid of its female lead so suddenly and so abruptly? It may have been caused by a reputed seasons-long feud between Katic and her co-star, Nathan Fillion, according to sources for Us Weekly. "Stana Katic and Nathan Fillion completely despise each other. They will not speak when they are off set, and this has been going on for seasons now… This season, it got so out of hand they made Stana and Nathan go to couples counseling together." Regardless of why she left, someone at ABC must have realized that moving the show forward without Katic was a ridiculous idea. By May of that year, the show had been canceled altogether. Bette Davis and Joan Crawford Bette Davis and Joan Crawford's feud on the set of What Ever Happened to Baby Jane? was so infamous that an entire FX miniseries was dedicated to their behind-the-scenes antics.

As People magazine pointed out, their real-life feud developed long before the movie, when the two mega-stars competed over the top female roles in Hollywood. However, as the actresses aged and acting opportunities decreased, the Oscar-winning duo supposedly tried to make amends for what they hoped to be a comeback movie with Baby Jane. Needless to say, it...didn't work out. Fights, petty antics, and more allegedly went on while they were filming the movie and continued well after, particularly when only Davis was nominated for an Academy Award for best actress. But Crawford fought back even then, convincing the category's eventual winner, Anne Bancroft, to let her accept the Oscar on her behalf. Supposedly, the feud continued all the way up until Crawford's death in 1989. Talk about bad blood. click here for more