 NBC's "The Tonight Show" is the world's longest-running talk show; having debuted in 1954, it continues to this day.The show underwent some minor title changes until settling on its current title in 1962, and despite a brief foray into a more news-style program in 1957 and then reverting that same year, it has remained a talk show.Ireland's "The Late Late Show" is the second-longest running talk show in television history, and the longest running talk show in Europe, having debuted in 1962.