Montenier himself appeared on the February 12, 1956 episode of What's My Line? as a Mystery Guest. As he signed in, he was identified on screen as "Dr. Jules Montenier, Creator & Manufacturer of Stopette"; his "line" was "Our Sponsor (For Past Six Years)." Prior to their guesses, the panel was given the hint that Dr. Montenier was self-employed. The panel failed to guess Montenier's line correctly; he "stumped the panel and won the game," as Mr. Daly's successor as moderator, Wally Bruner, preferred to phrase it. It turned out that the purpose for Dr. Montenier's visit was to give his belated congratulations to the show for its six years on television. Mr. Daly said that Dr. Montenier was a good sponsor because he refused to interfere with the production of the show. Dr. Montenier, in return, said that he loved the show and watched it each Sunday.
