"Late Night" under O'Brien slowly but steadily acquired commercial and critical success. Banter between O'Brien and Richter improved, and sketches grew in popularity ("If They Mated", "Desk Drive", "In the Year 2000"). A reliable staple involved a TV screen, lowered behind O'Brien's desk and displaying a still photo of a news figure. The lips and voice of these characters – frequently a party-crazed hillbilly interpretation of Bill Clinton – were supplied by writing partner Robert Smigel. A turning point was David Letterman's February 1994 appearance. "It was a morale boost," said O'Brien. "I'm thinking, If the guy who created the 12:30 thing comes on and says we're smart and funny, let's go." The show went through a wobble in January 1995 when Robert Smigel, feeling burned out, quit as head writer. The show's quality improved slowly over time, and most credit O'Brien's growing comedic performance. Within a year, a comedic formula began to arise: the show would combine the lewd and wacky with a more elegant, narrative-driven remotes. Regular characters would typically include a "Masturbating Bear" and a famous remote found Conan visit a historic, Civil War-era baseball league. That piece was one of O'Brien's personal favorites, later remarking, "When I leave this earth, at the funeral, just show this, because this pretty much says who I'm all about."