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Conan O'Brien (b. 1963) is the host of Late Night with Conan O'Brien, and former writer for The Simpsons and Saturday Night Live.
Kermit the Frog has made an appearance on his show.
O'Brien has made guest appearances on Sesame Street, including the celebrity version of "Sing," included on Episode 3851 and also appeared in Kermit and Piggy's music video "She Drives Me Crazy."
During a race to the broadcast room in order to deliver a tape in Elmopalooza, Big Bird passes through the set of Late Night where Conan O'Brien is interviewing the Yip Yip Martians. Andy Richter can also be seen in this very short bit.
In an appearance on The Tonight Show hosted by Jay Leno on March 27, 2008, O'Brien discussed being recognized on the street. He said to Leno that "A lot of people can blend in...but you and I are like Muppets, you know. We're very, we have distinctive looks, you know. And I'm just like, when I put on a hat and glasses I'm like Big Bird putting on a hat and glasses. People just think, "Oh, Big Bird's trying to walk down the street" and I'm like (accompanied by walking motions) GALOMPH, GALOMPH, GALOMPH, you know, (in a high voice) leave me alone!"