During his time as a writer for Letterman, Subitzky was partly responsible for conceiving and writing a comedy sketch about a person who pretends to be a well-known celebrity so that he can be on television. Subitzky was then invited to play the part that he had helped develop. Because of this, Subitzky was featured as a comedy actor on "The David Letterman Show" at least four times in 1980, in variations of the same basic sketch, which is known as “The Imposter".