 Cape Horn), and the fact that "horn" is slang for an erection.Spike Milligan, writer of "The Goon Show", remarked that a lot of "blue" (i.e.sexual) innuendo came from servicemen's jokes, which most of the cast understood (they all had been soldiers) and many of the audience understood, but which passed over the heads of most of the Senior BBC producers and directors, most of whom were "Officer class".