The Tonight Show Starring Johnny Carson is a talk show hosted by Johnny Carson under The Tonight Show franchise from October 1, 1962 through May 22, 1992. It originally aired during late-night. For its first decade, Johnny Carson's The Tonight Show was based at Thirty Rockefeller Plaza, New York City, with some episodes recorded at NBC-TV's West Coast studios in Burbank, California; on May 1, 1972, the show was moved exclusively to Burbank. Wikipedia
(Ed is laughing to himself)
Karnack: (annoyed) Karnack is attempting to divine an answer and you're sitting here, giggling. May I have silence, please?
Ed McMahon: Of course. You've had it many times before.