Who Is Jon Stewart's Worst Guest of All Time?

It's safe to say Jon Stewart isn't a member of the Hugh Grant fan club. The Daily Show host recently told Stephen Colbert that Grant is his least favorite guest of all time.
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"And we've had dictators on the show," Stewart pointed out, as he was being interviewed by Colbert at a fundraiser in New Jersey for the Montclair Film Festival, according to Third Beat.

According to Stewart, when Grant came on the show in 2009 to promote the film Did You Hear About the Morgans?, he complained that he had other places to be. "He's giving everyone s--- the whole time, and he's a big pain in the a--," Stewart said, according to Third Beat, adding that he would never have the British actor back on the show.

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Grant also reportedly said that the film clip that was aired during his segment was "terrible."

Stewart's response?  "Well, then make a better f------ movie."

Are you surprised? And what other celebrities do you know of who have a reputation for being somewhat salty?