By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...

By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...

By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...

By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...

By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...

By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...

By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...

By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...

By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...

By Tim Molloy NEW YORK (TheWrap.com) - Bill Murray, the first guest on "The Late Show With David Letterman," will return as a guest on Thursday to mark its 20th year on the air. Murray first appeared n the show on its first episode on August 30, 1993. This will mark his 26th appearance on the show. Murray was also the first guest on Letterman's NBC series, "Late Night," when it debuted in 1982. Last year, he visited the "Late Show" to mark the 20th anniversary of that appearance. He nearly started a fire while lighting a cupcake in honor of the big day. ...