Henry, we promise to put these back where we found them", at which point the center stage curtain rose to reveal (what is assumed to be) Morgan's bed. Notable guests on the show I've Got a Secret was host to many notable guests over the course of the show's run. History and style I've Got a Secret was more informal than sister show What's My Line? in most respects. The panel and host were generally on a first-name basis. As noted, the formal time limit on questioning was removed early in the show's run, and time limits were set more for entertainment. The men on the panel always wore normal suits or even sport jackets, though both Morgan and Moore sometimes chose bow ties over straight ties. Until the later years of the series, both Moore and members of the panel smoked cigarettes on the air, with Moore doing so right up until his last episode. The panel was introduced at the start of each episode by the host, usually with a series of descriptive puns. Only yes-or-no questions were supposed to be asked by the panel, but the format was often relaxed, and other questions slipped through. Unlike on What's My Line?, the host often offered hints and suggestions when the panel was off in the wrong direction, or when an answer might be misleading. Unlike on What's My Line?, the panelists were not allowed to formally confer with each other, though later in the series, there was no chastising of the panelists for whispering ideas to each other. The series began in black-and-white, and only in 1966 switched regularly to color, though like most programs of this era, existing records are in black and white. The series was sponsored for most of its run, with the opening of the show featuring a promotion for whichever company was the sponsor, signage on the set, and commercials being included during the show. Some sponsors provided samples of their wares for each contestant, in addition to their winnings. Late in the series' run, sponsorship was discontinued. I've Got a Secret was, along with What's My Line? and To Tell the Truth, canceled in a mass axing of CBS's remaining panel shows in 1967; the shows were still financially successful but were not drawing good ratings, especially among the key demographics. Of the three, I've Got a Secret was the only one