So a modern-day genie can’t find an oil lantern and so takes up the first bottle available. It’s a shampoo bottle. Now, the genie’s all right with granting wishes and all that, except they come out all goopy and in need of a rinse and maybe conditioning. Also, the bottle-owner can always get a little bit more out of a wish by standing the bottle upside-down for a few minutes, as long as it doesn’t slip on the wet surface. And I’m not sure about this part but there may be an enchanted loofah.
Well, if you can’t do anything with that, I talk some more about mathematically-themed comic strips over on my mathematics blog. You can use that, surely.