IN: Edward Leo Peter McMahon Jr. (March 6, 1923 - June 23, 2009) was an American announcer, game show host, comedian, actor and singer. McMahon and Johnny Carson began their long association in their first TV series, the ABC game show Who Do You Trust?, running from 1957 to 1962. Then afterwards, McMahon would make his famous thirty-year mark as Carson's sidekick, announcer and second banana on NBC's highly successfully The Tonight Show Starring Johnny Carson from 1962 to 1992.

The pair joined The Tonight Show Starring Johnny Carson on October 1, 1962 on NBC. He describes what happened when the pair first met, the whole meeting being "... about as exciting as watching a traffic light change". For almost 30 years, McMahon introduced the show with a drawn-out "Heeere's Johnny!" His booming voice and constant laughter alongside the "King of Late Night" earned McMahon the nickname the "Human Laugh Track" and "Toymaker to the King". As part of the introductory patter to The Tonight Show, McMahon would state his name out loud, pronouncing it as , but neither long-time cohort Carson nor anyone else who interviewed him ever seemed to pick up on that subtlety, usually pronouncing his name . Aside from his co-hosting duties, it also fell upon McMahon during the early years of Carson's tenure (when the show ran 105 minutes) to host the first fifteen minutes of Tonight, which did not air nationally. McMahon also served as guest host on at least one occasion, substituting for Carson during a week of programs that aired between July 29 and August 2, 1963, and again for two nights in October 1963. McMahon served as a counter to the notoriously shy Carson. Nonetheless, McMahon once told an interviewer that after his many decades as an emcee, he would still get "butterflies" in his stomach every time he would walk onto a stage and would use that nervousness as a source of energy. His famous opening line, "Heeere's Johnny!", was used in the 1980 horror film The Shining by the character Jack Torrance (played by Jack Nicholson) as he goes after his wife and child with an axe. He did in-program commercials for many sponsors of The Tonight Show, most notably Budweiser beer and Alpo dog food, and also did commercials for them that ran on other programs.

Why did it fall upon McMahons shoulders?

OUT: substituting for Carson during a week of programs that aired between July 29 and August 2, 1963, and again for two nights in October 1963.

IN: Andy Samuel Griffith (June 1, 1926 - July 3, 2012) was an American actor, comedian, television producer, Southern gospel singer, and writer, whose career spanned seven decades of music and television. Known for his southern drawl, his characters with a folksy-friendly personality, and his gruff, gregarious voice, Griffith was a Tony Award nominee for two roles, and gained prominence in the starring role in director Elia Kazan's film A Face in the Crowd (1957) before he became better known for his television roles, playing the lead roles of Andy Taylor in the sitcom The Andy Griffith Show (1960-1968) and Ben Matlock in the legal drama Matlock (1986-1995).

Griffith's early career was as a monologist, delivering long stories such as What It Was, Was Football, which is told from the point of view of a naive country preacher trying to figure out what was going on in a football game. The monologue was released as a single in 1953 on the Colonial Records label, and was a hit for Griffith, reaching number nine on the charts in 1954. Griffith starred in Ira Levin's one-hour teleplay version of No Time for Sergeants (March 1955) -- a story about a country boy in the United States Air Force -- on The United States Steel Hour, a television anthology series. He expanded that role in Ira Levin's full-length theatrical version of the same name (October 1955) on Broadway in New York City. The role earned him a "Distinguished Supporting or Featured Dramatic Actor" nomination at the 1956 Tony Awards, losing to Ed Begley. He did win the 1956 Theatre World Award, however, a prize given for debut roles on Broadway. "Mr. Griffith does not have to condescend to Will Stockdale" (his role in the play), wrote Brooks Atkinson in The New York Times. "All he has to do is walk on the stage and look the audience straight in the face. If the armed forces cannot cope with Will Stockdale, neither can the audience resist Andy Griffith." Griffith later reprised his role for the film version (1958) of No Time for Sergeants; the film also featured Don Knotts, as a corporal in charge of manual-dexterity tests, marking the beginning of a lifelong association between Griffith and Knotts. No Time for Sergeants is considered the direct inspiration for the later television situation comedy Gomer Pyle, U.S.M.C. His only other New York stage appearance was the titular role in the 1959 musical Destry Rides Again, co-starring Dolores Gray. The show, with a score by Harold Rome, ran for 472 performances and more than a year. Griffith was nominated for "Distinguished Musical Actor" at the 1960 Tony Awards, losing to Jackie Gleason. He also portrayed a US Coast Guard sailor in the feature film Onionhead (1958); it was neither a critical nor a commercial success.

When did he start acting?

OUT:
Griffith starred in Ira Levin's one-hour teleplay version of No Time for Sergeants (March 1955) --