Friday, February 7
(Undated) -- Another chapter in "Tonight Show" history is over. On Thursday, Jay Leno ended his 22-year run as host of NBC's late night talk show. Leno tearfully thanked the audience who contributed to his consistent number one ratings. The night's only scheduled guest, Billy Crystal, surprised Leno by bringing a host of celebrities with him to sing goodbye. The group included Oprah Winfrey, Jack Black, Sheryl Crow, and Carol Burnett. Jimmy Fallon will take over as "Tonight Show" host on February 17th.