Remember those old days metal pen refillfs with color marking on them? They should easily cause a rejection due to prior art, though I doubt if that patent will be approved in the US anyway, due to obviousnes.
The US patent office is a stamp factory, you pay the fee, they stamp your document - no questions asked. The US patent system is flooded with thousands of obvious (and ridiculous) patents.
The US is the country where Amazon patented saving your payment information so you can check-out in a webshop with a single click. Or where Microsoft patented double-clicking a mouse. It's the holy land of patent trolls and blood-sucking lawyers.
That's only if you start delivering live monkeys after the patent is granted, if you were in the business beforehand you can continue without any problems.Its called grandfather rights here in the UK.
Well... that's still failed, in that case (if someone other than the patent owner is already delivering monkeys with bicycles), the patent shouldn't have been granted on basis of prior art.
Anyway, "using (obvious solution) A for (generic random use-case) B" is not a technical solution. I'd argue it's not even an idea.
"Using salt to make soylent green taste better" should not be patentable in any sane system, even if nobody had done it before.