Today a joke I read many years ago came back to me.
A pair of incompetent counterfeiters printed some $18 notes. Thinking that perhaps they could fool country folk, they rock up at a grocery store in a small town.
"Would you be able to break up an $18 note?", one says to the shopkeeper.
"Sure, would you like threes or sixes?", replies the shopkeeper without batting an eyelid.
