The Lucy Show (1962)

Season 5: Episode 1

George Burns arrives at the bank to pick up his statement, but Mr. Mooney has problems locating it. While waiting for Lucy to return to work, Mooney and Burns chat, and Mr. Burns reveals that he's having trouble finding another girl to be in his act. Enter Lucy, who goes on to explain her rather unique filing system, impressing George so much that he asks her to be his new comedy partner. The two go on to do a hit show and are offered a gig in Las Vegas, but Lucy declines, saying that she could never leave Mr. Mooney behind.