There are probably more than ten reasons why you shouldn't insult your boss and assault your co-worker, as a longtime Late Show With David Letterman staffer has learned.

Late Show cue card writer Tony Mendez, known to the show's watchers for his regular on-camera appearances, has been fired from the show after physically confronting staff writer Bill Scheft. The New York Post previously reported the news.

On Oct. 8, Mendez was rehearsing with Scheft and David Letterman in the host's dressing room. Mendez didn't appreciate Scheft interrupting him, and so he snapped at Scheft: "I know what I'm doing! Get off my back."

Letterman then called Mendez out for his sour disposition, and Mendez fired back at the host, "You’re the one who has the sour disposition, motherf—er."

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The next day, when Mendez saw Scheft in the office, he grabbed Scheft by the shirt and threw him against the wall. At that point, Late Show executive producer Rob Burnett informed Mendez that his position was terminated.

"I know I shouldn’t have put my hands on him," Mendez told The Post. Mendez points out that he has felt undermined by Scheft in the past, adding: "This [altercation] has been coming for a long time."

Mendez said that he doesn't have any regrets about how he acted and called Letterman "the best, the most generous boss I have ever had."

A rep for Worldwide Pants, which produces the Late Show, told The Hollywood Reporter that the company "cannot comment on confidential personnel matters."

Mendez joined the Late Show in 1993. In addition to having appeared in scripted bits on the show, which often involved him losing his temper and storming off the set, he also hosts his own YouTube show

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favrefan said:"Chris Coghlan isn't gonna pay your rent, Jimmy."