"Lucy Does a TV Commercial" is the thirtieth episode of the 1950s television sitcom I Love Lucy, airing on May 5, 1952. It may be the most famous episode of the show. In 1997, TV Guide ranked it #2 on their list of the "100 Greatest Episodes of All Time". In 2009, they ranked it #4 on their list of "TV's Top 100 Episodes of All Time." The initial episode was watched by 68% of the television viewing audience at the time.