Pre-Digital and Obscure to the Point of Utter Opaqueness

Life in general and shift-work in particular have put a huge dent in my ability to produce anything recently (dozing off in front of the telly may also be a contributory factor, but we won't dwell on that particular fact). My adoring fan-base (that's you, Dave) implored me to take a more active part in the Cartoonists' Club of Great Britain's weekly caption competition. The truth is I have, in actual fact, tried and I have several examples of roughs up in the office that act as testament to this, but of finished product I have none. I promise I will make time and remedy this dolorous situation.
In the meantime I offer up this example from the past. It is a pen and ink re-working of an older pen and ink drawing. As my adoring fan-base will attest, it is far too obscure for a general audience (or should that be readership? What the hell are you, you unnatural beast?). At base, it is a straight forward pun - a play on the German pronunciation of Weill and the English pronunciation of    leptospirosis. Or something like that. You see, the rat in the background is singing a song from Bertolt Brecht and Kurt Weill's Threepenny Opera. And the thigh-slappingly upshot is...
My goodness, that was a rather deafening silence.