Hereâs a short snippet from Conan OâBrienâs audition to be the host of NBCâs Late Night, which OâBrienâs website Team Coco released this week to commemorate the 20th anniversary of said audition. Then a writer for The Simpsons, OâBrien was asked to do an off-air trial show with a live studio audience. His guests were Mimi Rodgers and Jason Alexander, and he ended the show with a classy, humble goodbye: âThatâs the end of my mock show. If thatâs all I ever get, it was a lot of fun. I had a good time. Thank you very much.â