▶ What's My Line? - Lucille Ball & Desi Arnaz (Oct 2, 1955) - YouTube (I'm posting these to watch later, I will forget they are there. They are cracking me up but I mostly only watch the last 10 minutes.)
Original panelists from the premier broadcast of What's My LIne?, 1950--What’s My Line? was a guessing game in which four panelists attempted to determine the line (occupation), or in the case of a famous "mystery guest," the identity, of the contestant. Panelists were required to probe by asking only questions which could be answered "yes" or "no".