![What's My Line?](http://image.tmdb.org/t/p/w185/A9T7xSQFnlxFgZkqC4lmHYPXhq4.jpg)
Four panelists must determine guests' occupations - and, in the case of famous guests, while blindfolded, their identity - by asking only "yes" or "no" questions.
Four panelists must determine guests' occupations - and, in the case of famous guests, while blindfolded, their identity - by asking only "yes" or "no" questions.