That reminds me of an old joke I heard in the pub Gundy.
Hand a friend a £5 note and tell them to find the two red-indians that are printed on it, there is one on each side. If they can find it they get to keep the money.
They'll look and find a tiny picture of a red indian looking chap on the one side but they won't find anything on the other. When they give up you point to the signature at the bottom which reads just underneath, "Chief Cashier". 😄