Yes, even the most popular talk shows secretly ban celebrities. That was the case with the late Barbara Walters, who wasn't the biggest fan of Kathy Griffin - though she didn't let that be known to the public.
That was far from the only time, Conan O'Brien was forced to temporarily ban Dax Shepard after their interview went completely off the rails, with Dax stumbling his words, and even falling over O'Brien's desk.
Kyle and Jackie O gave Matt LeBlanc a ban for different reasons, stating that the actor gave them nothing during their interview.
In the following, we'll take a look at certain guest Letterman banned for life. James Franco heard a certain side of the story, however, Letterman deemed that as a lie, and explained what really happened, and why the guest didn't get invited back.
David Letterman Had More Than A Few Interviews Go Completely Sideways
We've seen this on multiple occasions, interviews getting completely derailed because of a comment or moment. On David Letterman's Late Show, we've seen that awkward moment on a couple of occasions.
One memorable moment to take place, featured an audience member shouting at Oprah for her devil-worshipping story that had taken place on one of her recent shows. Oprah wasn't happy with the fan, nor was she happy with Letterman's reaction. This would cause a split between the two TV personalities for years.
Angelina Jolie also didn't look overly-stimulated during her appearance on the Late Show in the '90s. It is said that the actress didn't want to be there, given the way Letterman was treating some of his female guests.
The honor for most awkward interview ever gas to go to Crispin Glover, who almost knocked Letterman's head off on live TV with a kick. Letterman was clearly uncomfortable, and had to cut to a commercial in order to settle things down with his guest.
Still, that wasn't enough to ban any of his guests. That was until Harmony, and a particular moment that took place behind the scenes.
David Letterman Caught Guest Harmony Korine Looking In Meryl Streep's Purse Backstage
Thanks to James Franco, fans got a little more context as to why Harmony Korine stopped appearing on the Late Show, suddenly.
During their interview, James Franco brought up his name, and how he was in a better place at the time.
"Harmony is a very sane guy now, a great artist and great person to work with, but I think he had a period where he was going a little off the rails, so maybe he was on something that night," Franco said of the filmmaker.
Franco did some digging, and tried to find out why Harmony had got kicked off the show. According to his conversation with the filmmaker, it had to do with Meryl Streep, and an apparent shove that took place.
However, Letterman had a different side of the story.
"I went upstairs to greet Meryl Streep and welcome her to the show, and I knock on the door … and she was not in there," he said. "And I looked around, and she was not in there, and I found Harmony going through her purse. True story. And so I said: 'That's it, put her things back in her bag and then get out.'"
Back in 2008, Korine did reveal that things were falling apart in his personal life at the time.
"I became like a tramp. I wasn't delusional. I didn't think I was going to be OK. I thought: 'This might be the end.' I'd read enough books. I knew where this story ended. The story finishes itself."
Despite the controversy to take place behind the scenes, Korine was a popular figure, at least during his interviews with David Letterman.
What Did The Fans Think Of Harmony Korine's Appearances On The Late Show?
The last conversation relating to Harmony took place in 2013, though it was alongside James Franco during his appearance on the Late Show. Korine himself had a few appearances during the '90s, and his interviews always had the fans talking.
For the most part, fans raved about his intelligence, and how he was able to think differently.
"Harmony is such a unique human being, I’ve never heard anyone else talk or act the way he does, each line he says could be a comedic quote out of context but even in context it’s still insane," one fan writes on YouTube.
Another fan writes, "This is a masterpiece of miscommunication, Letterman thinks that Korine is joking when he isn't, and then is offended when he tries to play with him."
"Korine is trying to fit what he's thinking into short soundbites he thinks they want but it just descends into adversarial mood... Being high as hell maybe contributed though!"
Perhaps Dave had it with the interviews, and his antics backstage sealed his fate.