You'd be surprised how much innuendo can come out of ridiculously simple situations. Like offering someone a utensil. The term "runcible", by the way, comes from Lear's famous 1871 poem "The Owl And The Pussycat": They dined on mince and slices of quince, which they ate with a runcible spoon. He apparently grew very fond of the term, using the adjective on hats, cats, geese, and a wall. He didn't, of course, make any attempt to define it, and as such it can refer to a multitude of objects. Its more common definition is something akin to a pickle fork, though that makes no sense, given the existence of a runcible spoon. I myself prefer to think of it as a spork reference, and more generally as a term for all cutlery. None of this, of course, explains Lear's texts. Such an analysis is far beyond the scope of this mere footnote. Not to mention the inherent difficulty in explaining nonsense verse....