"They said I wasn't being funny," Stewart later said. "And I said to them, 'I know that, but tomorrow I will go back to being funny, and your show will still blow.' "
6. Kate Moss vs. Jade Jagger
The great fashionista fallout of 2000 began when Kate Moss started dating Jade Jagger's former boyfriend Dan Macmillan. Jagger, a jewelry designer and daughter of Mick, sent her former friend a diamond-encrusted necklace that spelled out "Slag," and the two didn't speak for four years.
Macmillan has since moved on. Moss and Jagger finally mended fences this summer, throwing a party together last summer on an island off Spain. No word yet on what became of the necklace.
7. Dixie Chicks vs. Toby Keith
Toby Keith started trading barbs with the Dixie Chicks after the Chicks came out against President Bush's policies in Iraq. In March 2003, lead singer Natalie Maines told a London audience the band was "ashamed the president of the United States is from Texas."
Maines wore a T-shirt that read, "F.U.T.K." at Country Music's ACM Awards and Keith took it as a personal message to him. The group's Web site said "F.U.T.K." actually stands for "Freedom, Understanding, Truth & Knowledge."
Nevertheless, Keith's fans responded with shirts that read "F.U.N.M.," which might as well stand for "Freedom and Understanding in New Mexico."
8. Corey Feldman vs. Michael Jackson
Corey Feldman was the 13-year-old star of "The Goonies" when he met Michael Jackson in 1985. His new superstar friend visited the child actor on movie sets, taught him his signature dance moves and bought him matching clothing.
The Jackson-Feldman fallout came the week of the Sept. 11, 2001, attacks. Jackson had invited Feldman to New York City for the taping of the much-ballyhooed show celebrating his 30 years as a solo artist.
But with the World Trade Center collapsed and smoke engulfing the city, Jackson wanted to make sure Marlon Brando, Elizabeth Taylor and other guests got home safely. He loaded up his tour bus, but had no room for Feldman, who was left to fend for himself.
Feldman never forgave his old friend, and shot back at him with a song called "Megalo-Man," with lyrics like, ""I believed in your words/ I believed in your lies/ But in September in New York/ You left me to die."
Over the years, Feldman repeatedly said Jackson never touched him inappropriately. But in an interview in February with "20/20's" Martin Bashir, Feldman said he now questions some of Jackson's conduct.
Jackson is now on trial on charges he molested a 13-year-old cancer survivor and plied the boy with alcohol. He has pleaded not guilty.
ABC News reported in February that Feldman was subpoenaed by prosecutors and is now under a gag order as a potential witness.
9. Michael Jackson vs. Eminem
Jackson has engaged in many celebrity feuds over the years. His friendship with Paul McCartney, who wrote a song for his landmark album "Thriller," ended after Jackson outbid him for ownership of the Beatles' song catalog.
McCartney says he had advised his former friend to invest in music publishing, and called him "dodgy." They never again worked together.
In 2002, Jackson took on Sony Music Chairman Tommy Mottola, declaring that he's ""mean," "a racist" and "very, very, very devilish." The singer accused Mottola of deliberately undermining his 2002 album, "Invincible."
The protest Jackson led on Sony headquarters in New York did very little to spark album sales.