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Graham Norton -

'The Graham Norton Show' has had many A-listers as guests, but there is one that Norton found particularly boring. 

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Robert De Niro -

"He's not a storyteller, or very verbal. He's a benign presence. Last time he started telling a story—he went on and on. We were all leaning in, willing it to be amazing ... then he finally went, 'why am I telling this?' Nobody had an answer. We cut it," said Norton.

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The cast of 'Ocean's 8' -

But the cast of 'Ocean's 8,' including Sandra Bullock, Cate Blanchett, Rihanna, Helena Carter, and Sarah Paulson also made talk show history.  "I felt like the guy driving the bus on a hen party. For 45 minutes people were talking over each other and laughing ... They were having a great time but the audience was nonplussed," he explained.

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Oprah Winfrey -

The famous TV host said that one of her worst guests was actually not an A-lister; it was a lawyer who went on her show to promote his book. "He mentioned the book 29 times. That's after I started counting," she said.

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Oprah Winfrey -

It's safe to say that Oprah had a few awkward moments on TV, including one with Tom Cruise. He spent the show talking about his then-girlfriend Katie Holmes and at some point he grabbed Oprah's arms in excitement and started shaking them!

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Jon Stewart -

Jon Stewart famously banned Hugh Grant from 'The Daily Show' because of his behavior. He's still Stewart's worst guest to this day, "and we've had dictators on the show," the host said.

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Hugh Grant -

Grant took to Twitter afterwards to acknowledge that his behavior was out of line and said he agreed with Jon Stewart's decision to ban him from the show.

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Conan O'Brien -

'Late Night with Conan O'Brien' has had its fair share of peculiar guests, but according to the TV host, none as bad as director Abel Ferrara in 1996.

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Abel Ferrara -

The story goes that he ran away during the show, just before he was supposed to go on. "He ran away, got on the elevator, and was out on the street running away," said the TV host. He eventually returned to the studio and reportedly started yelling at Conan O'Brien.

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Wendy Williams -

Williams had to deal with a more serious situation. The host said she wasn't going to reveal the name, and that the guest touched her inappropriately. "And you all saw it but didn't say a word. And I felt it and I didn't say a word. My staff saw it, and that guest will never be here anymore. He's not relevant anymore, anyway," confessed the TV host. 

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Gilbert Gottfried -

After Wendy Williams' declarations, Twitter users quickly identified the guest as comedian Gilbert Gottfried.
 

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Lorraine Kelly -

With a career on TV spanning over 35 years, the Scottish TV host has met a few peculiar characters. 

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Kevin Spacey -

Topping the list is Kevin Spacey. "He was horrible. Just very arrogant. I didn't like him at all," confessed Kelly.  

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Harrison Ford -

Ford also makes Kelly's list of undesirable guests. "I don't think [Ford] particularly liked the movie that he was promoting, and he just wasn't really happy," the TV host said.

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Larry King -

The late TV host confessed that Phyllis Gates, wife of the late actor, Rock Hudson, was his worst guest.

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Phyllis Gates -

Gates simply didn't speak, she would give one-word answers to King's questions. "I look up at the clock, I'm four minutes in. I got another 56 minutes to do with this woman, who has nothing to say," said the TV host.

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Jay Leno -

Over the years, Leno had many difficult guests as the host of 'The Tonight Show with Jay Leno.' But he has a special pet peeve: reality stars.

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Trista Sutter -

Leno confessed to be quite disinterested when he had the original star of 'The Bachelorette' on the show. 

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Trista Sutter -

Later on, the TV host was approached by a woman in the parking lot, who asked him to take a picture. Not even realizing who it was, he asked for her name. It turned out it was his guest. Yikes!

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Chelsea Handler -

The host of 'Chelsea Lately' found that one of her guests was a huge pain to deal with. 

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Russell Brand -

Handler said that she would never want him back on the show. "He stopped all of our production schedules because he needed three espressos before he could even come on for his interview," she revealed.

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Craig Ferguson -

The worst guest the TV host ever had on 'The Late Late Show with Craig Ferguson' was singer Macy Gray.

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Macy Gray -

"I think she was in a bad mood that night," said Ferguson. "I don't think she's a bad person ... and I was very new and I couldn't handle it."

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Johnny Carson -

The late TV host has had many high-profile guests over the years, but comedian Bob Hope seemed to be the worst. 

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Bob Hope -

Though mostly triggered by competition, they did get on well on the surface, but Carson was not really a fan of Hope's humor. 

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Andy Cohen -

Can you guess who is Andy Cohen's worst guest? Hint: someone who didn't want to answer any of his "shady questions." 

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Amber Rose -

"She did not come to play," Cohen said. "She turned to me, she goes, 'Am I a horrible guest?' I go, you are in the running for one of the worst guests we've ever had," said Andy Cohen.

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Debra Winger -

This actress is also in Cohen's list of bad guests. "You know what's weird about Debra Winger? We really did connect, and during the commercial break, she kept saying, 'You know, you're like my Jewish little brother. I feel connected to you.' But then when the camera came on, she wasn't having me," confessed Cohen.

Sources: (Nicki Swift) (Best Life)

See also: Talk show secrets all live TV audiences should know

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