M.G.M -- A Palindromic Legend

PEPSI IS PEP. This famous palindromic slogan was, so it is alleged, coined by the Hollywood legend Joan Crawford when she and her husband ran the soft-drink conglomerate. Others attribute it to the movie historian Bert N. Weepy, though I would not be surprised if it transpired that yet a third name cam under the investigative scrutiny of logological research. But, could the movie queen be the true coiner? To find the answer, we must examine the attitudes to word play in her cinematic thespian days