1. Steven Seagal versus John Leguizamo on Executive Decision: Warner Bros., CBS At the time of filming 1996's action/thriller Executive Decision, aikido expert Steven Seagal was a huge action star. According to co-star John Leguizamo, Seagal was also a huge something else, and in an interview with The A.V. Club, said that when Seagal arrived at rehearsal "he told everyone, 'I’m in command. What I say is law.' So I started, like, laughing. I mean, who the fuck talks like that? Who comes into rehearsal and says that shit? So I started laughing and he slammed me with an aikido elbow against a brick wall and knocked all the air out of me. I dropped to the ground, and all I could say was, 'Why? Why?'” Leguizamo went on to say, "On the day when we shot the scene where his character died, I showed up so early. I wanted to see him die." 2. Sylvester Stallone versus Richard Gere on The Lords of Flatbush. United Artists, Getty Images Before Sylvester Stallone was world-famous for Rocky and Richard Gere made it big with An Officer and a Gentleman, the two were cast in 1974's The Lords of Flatbush and did NOT get along. Stallone told Ain't It Cool News that Gere "would strut around in his oversized motorcycle jacket like he was the baddest knight at the round table." Later, after rehearsals for a fight scene got testy, things got physical...while eating lunch. Stallone said he was eating a hot dog in a car when Gere got in while eating some greasy chicken. "I said, 'That thing is going to drip all over the place.' He said, 'Don’t worry about it.' I said, 'If it gets on my pants, you’re gonna know about it.' He proceeds to bite into the chicken and a small, greasy river of mustard lands on my thigh. I elbowed him in the side of the head and basically pushed him out of the car." Gere was soon replaced on the film by Perry King.According to Elton John's autobiography Me, the hate between the two still burned red-hot two decades later. At a party at John's house, Gere and Princess Diana had hit it off and were talking closely. This made Stallone jealous (John conjectured Stallone had come in hopes of picking up Diana), and John's now-husband David Furnish soon found the two stars out back, squared off and about to fight. Furnish broke up the fight, and not long after, Stallone left in a huff when Gere and Diana rekindled their chat. 3. Jennie Garth versus Shannen Doherty on Beverly Hills, 90210. Fox The original Beverly Hills, 90210 was THE show for teens in the '90s, but while teens loved Garth and Doherty, the two did not exactly love each other. Garth told Watch What Happens Live with Andy Cohen “we were young and so stupid.” She mentioned an incident where, after Doherty pulled up Garth's skirt, "we took it outside.”Co-star Tori Spelling wrote in her 2008 memoir sTori Telling that Doherty and Garth had a fist fight, but the two now-friendly actors — in an interview with Entertainment Weekly — denied punches were thrown. However, Garth did say, “Scratching? I’m not going to deny that." 4. LL Cool J versus Jamie Foxx on Any Given Sunday. RINGO CHIU/AFP via Getty Images Oliver Stone's 1999 NFL football drama Any Given Sunday was a testosterone-filled project, so perhaps it's no surprise that co-stars LL Cool J and Jamie Foxx went at it one day.LL and Foxx were filming a scene where their football player characters were arguing on the sidelines next to their coach, played by Al Pacino. This scripted argument soon turned real with Foxx slapping LL, and the legendary Pacino tried in vain to break up the fight between the much younger men.Cinematographer Sal Totino recounted to The Ringer in their oral history of the film that LL threw a "fucking massive punch that hits Jamie in the face. Jamie goes back and hits the push bar on the techno-crane. I thought he snapped his neck. Jamie pops up, full-blown fight going on. Punches are flying everywhere."Six-foot-five co-star Andrew Bryniarski added, "Oliver (the director) grabbed my arm and said, 'Andrew go do something!' I’m like, 'Fuck.' So I tackled LL Cool J, pinned him to his stomach." Things got so bad that Foxx called the police, though no charges were pressed. LL and Foxx get along better today — that's them in the photo above singing together at a 2015 tribute concert to Stevie Wonder. 5. Tom Hardy versus Shia LaBeouf on Lawless. Gareth Cattermole / Getty Images What happened between the actors on the set of 2012's Lawless isn't exactly clear. When Den of Geeks asked Hardy about the rumor he and LaBeouf got in a fight that resulted in Hardy being knocked out, Hardy replied, “He knocked me out sparko. Out cold. He’s a bad, bad boy. He is. He’s quite intimidating as well. He’s a scary dude.” Recently, though, LaBeouf told Hot Ones that Hardy tells that story as a joke. The truth is, he continued, that he and Hardy "used to fuck with each other all the time" and that one day Hardy barged in on LaBeouf and his girlfriend when they were naked together, grabbed LaBeouf, and started wrestling with him. He then fell down some stairs, knocking himself out. Um, OK?Clouding things even more is Lawless director John Hillcoat, who, during a Reddit AMA, said it wasn't true that LaBeouf knocked out Hardy, but that "there was definitely a fight between them. It escalated to the point where they had to both be restrained." 6. Chevy Chase versus Bill Murray on Saturday Night Live. Warner Bros./Universal/Columbia According to Nick de Semlyen's Wild and Crazy Guys: How the Comedy Mavericks of the ’80s Changed Hollywood Forever, Murray — who was mad Chase left SNL after only one season for a higher-paying gig — punched Chase in the face backstage when Chase returned to guest host the show in 1978.“It was a huge altercation,” said director John Landis, who was there. “They were big guys and really going at it." The comedy legends got along better later, especially when they appeared together in 1980's Caddyshack. 7. Patrick Dempsey versus Isaiah Washington on Grey's Anatomy. ABC If you thought there was drama on the show, wait until you hear this. Washington told Larry King Live that the fight began when Dempsey was late to set and then refused to shoot until co-star Ellen Pompeo arrived. Washington says he answered this by saying, "I don't need Ellen. I can act," implying Dempsey couldn't. This enraged Dempsey, who got in Washington's face. There were reports the two had a "violent brawl," but Washington says they only exchanged shoves.Regardless of how physical the altercation was, it became verbally heated, and Washington uttered a gay slur. Washington denied the slur was directed at co-star T.R. Knight, but Knight told Ellen DeGeneres on her show that he believed it was. Washington was soon written off Grey's Anatomy. 8. Joan Crawford versus Bette Davis on What Ever Happened to Baby Jane? Warner Bros. Academy Award winners Joan Crawford and Bette Davis were huge stars in the '30s '40s, and '50s who despised each other. There were many reasons for their rivalry, including jealousy over a man (actor Franchot Tone) and many attempts to undermine each other's careers.Despite their decades-long feud, they signed on to co-star in 1962's Whatever Happened to Baby Jane? While shooting a scene where Davis's character beats Crawford's, Davis was reported to have hit Crawford so hard that she needed stitches. Later, Crawford is said to have gotten revenge by wearing a wrestler's belt in a scene where Davis — who had back problems — was supposed to drag her across the floor.The feud went on for years after that, and their story was made into the appropriately titled FX miniseries Feud. 9. Johnny Depp versus the location manager on City of Lies. Miramax If you're thinking "what the heck is City of Lies?" — you're not alone. City of Lies — about the Los Angeles Police Department's murder investigations of Tupac Shakur and The Notorious B.I.G. — was shot in early 2017 but never came out in America because of an incident with its star, Johnny Depp.The production had shut down a street in Los Angeles for filming when, after a long day, they went over their permit's allotted time. Gregg “Rocky” Brooks, the location manager, told Depp they needed to stop filming, and that's when — allegedly — an inebriated Depp hit Brooks repeatedly. Brooks later filed a lawsuit against Depp, the director, and the production, which appears to be why the film's domestic release was canceled. Another theory? Depp's incident was blown out of proportion and the real reason for the cancellation was because of — again allegedly — pressure from the LAPD because they didn't like the light the film put them in!