I think it's in reference to the cola but taken the other way can be.......problematic I've seen some pretty screwed up signs like that before as well, wish I had some pics.
i saw a Perkins sign last night... I didnt get a photo of it, but here's what it SHOULD have looked like- some lights were out though giving a slightly different message-
it is more or less a steamed pudding with raisins. but whenever i order one i feel as if i was asking to get some sexually transmitted skin disease
we have this pub, near where i live,called....yeh, the fawcett inn! ps. spotted dick is nice with custard!