Funny business: the most intense comedian rivalries

Louis C.K. vs. Dane Cook - C.K. acknowledged the allegations in a 2010 interview, saying he "didn't like" Cook and that the comedian "bummed me out aesthetically." Cook replied on the 'WTF with Marc Maron' podcast, saying he "didn't steal anything." C.K. invited Cook on his show, 'Louie,' and the two made light of the feud.

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David Letterman vs. Jay Leno - These late night legends had a problem with each other, and Letterman (left) was not happy when Leno (right) replaced Johnny Carson on 'The Tonight Show.'

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David Letterman vs. Jay Leno - Leno and Letterman had a long-running feud, which was documented in the book 'The Late Shift,' which was later adapted into a movie.

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David Cross vs. Larry the Cable Guy - Larry the Cable Guy is the stage name of Dan Whitney (right), who was profiled for Rolling Stone in 2005. David Cross (left) was interviewed for the piece, and he slandered Whitney's persona and sense of humor.

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David Cross vs. Larry the Cable Guy - Whitney responded in his book, 'GIT-R-DONE,' defending his new style of comedy. Cross replied in an open letter, calling Larry's audience "simple."

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Joan Rivers vs. Chelsea Handler - Apparently, Joan Rivers (left) slandered Chelsea Handler (right) at a public event. "Joan Rivers? What the f*** do I care about Joan Rivers?" she asked Howard Stern back in 2012, as a response.

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Joan Rivers vs. Chelsea Handler - Rivers went to Howard Stern the very next day. She called Handler "ordinary," "not a genius," and a "whore."

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Chevy Chase vs. Bill Murray - 'Saturday Night Live' hit TV screens back in 1975, and Chevy Chase (right) was one of the show's most popular stars. However, he left after the first season, and Bill Murray (left) was summoned to replace him.

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Chevy Chase vs. Bill Murray - Chase returned to guest-host next season, and things got pretty tense. "I'm sure Billy wanted to take me down," Chase said in the book 'Live from the New York,' in which he also described a "fistfight that never really came to fruition."

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Norm MacDonald vs. Chris Kattan - Chase vs. Murray was a big feud, but MacDonald (left) vs. Kattan (right) is maybe the most infamous 'SNL' rivalry. MacDonald started with homophobic comments in a Rolling Stone profile.

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Norm MacDonald vs. Chris Kattan - "He seems gay [...] I've never seen… a guy who's not gay seem so gay," MacDonald sneered. Kattan replied by calling Norm an "asshole."

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Jon Lovitz vs. Andy Dick - Back in 1998, comedian Phil Hartman was killed by his wife Brynn in a murder/suicide. He had previously worked with both Dick (right) and Lovitz (left), and the latter apparently blamed Dick for Hartman's death.

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Jon Lovitz vs. Andy Dick - Lovitz reasoned that Dick gave cocaine to Brynn, who was a recovering addict. Dick apparently threatened Lovitz, and the two got into a physical altercation.

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Joe Rogan vs. Carlos Mencia - Back in 2005, Joe Rogan (left) accused Carlos Mencia (right) of plagiarism. Two years later, he confronted Mencia on stage, and uploaded the footage to YouTube.

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Joe Rogan vs. Carlos Mencia - Rogan was banned from the venue, and Mencia addressed the issue on 'WTF.' "I never had beef with him, he had beef with me," he shrugged.

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Denis Leary vs. Bill Hicks and Louis C.K. -

Denis Leary (center) has had his fair share of feuds. He rose to fame with Bill Hicks (right), and the two were even friends. However, Leary was accused of copying Hicks's style.

(Right photo: Wikimedia/CC BY 2.0)

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Denis Leary vs. Bill Hicks and Louis C.K. - Hicks joked about the accusations, saying that he "stole his act" in 1993. Separately, C.K. called Leary a "talentless c***," and that he "stole" from him too.

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Sam Kinison vs. Andrew Dice Clay - Clay (right) and Kinison (left) were on top of the comedy circuit in the early '90s. They were also bitter rivals, with Kinison calling out Clay in interviews with Howard Stern.

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Sam Kinison vs. Andrew Dice Clay - Clay responded by saying Kinison had a "black heart," and that he was a "horrible person," in an interview with the Los Angeles Times.

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Jamie Foxx vs. Howard Stern - Howard Stern (left) doesn't mince his words, and was blunt when slandering Gabourey Sidibe on-air. Jamie Foxx (right) wasn't having it, and fired back at Stern's cohost, Robin Quivers.

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Jamie Foxx vs. Howard Stern - Stern returned fire by implying that Foxx was a closeted homosexual. However, the two have since made amends.

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Katt Williams vs. Steve Harvey - Williams (left) apparently started this little feud, when he accused Harvey (right) of snubbing him in Los Angeles. Katt went on to clown Steve Harvey during a performance on New Year's Eve.

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Katt Williams vs. Steve Harvey - Harvey responded in an interview with Frankie Darcell, saying that he had "nothing to do with" it. "You wanna sell a ticket like that? Knock yourself out," he said.

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Arsenio Hall vs. Roseanne Barr - This apparently started when Hall (right) started cracking jokes about Barr (left) and her husband, mocking them for their weight.

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Arsenio Hall vs. Roseanne Barr - Barr responded in bold fashion, calling Hall a "black nerd." However, the two were able to talk it out on Arsenio Hall's show.

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Andy Kaufman vs. Michael Richards - Andy Kaufman (left) was an extremist comedian, one who pushed the limits of conceptual comedy. He made some rare appearances during the '80s, showing up on the sketch show 'Fridays,'

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Andy Kaufman vs. Michael Richards - During one sketch, Kaufman broke character, saying he felt stupid for doing the sketch. Richards responded by throwing cue cards on Kaufman's lap, getting a face full of water in return. The laughing audience were unsure if the physical altercation was genuine or not.

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Bill Cosby vs. Eddie Murphy - Murphy (right) was massive back in the late '80s, hot off the success of his film, 'Eddie Murphy Raw.' The show featured an impersonation of Bill Cosby (left).

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Bill Cosby vs. Eddie Murphy - Cosby was very popular on TV, but Murphy's impersonation had smeared his reputation. He responded to Murphy by calling him "a very nasty, nasty liar."

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