I had a friend who worked at a bank in college. He deliberately requested a stack of two dollar bills and then took everyone to a fast food place to order off the dollar menu. Utter confusion, with threats to arrest him for trying to use counterfeit money. None of the clerks or even the manager had seen a two dollar bill.
That type of confusion or the ability to pass fakes only goes up with other currencies.
Interesting experiment. I kept a two dollar bill for my grandson. Whenever he brings a new friend over he always wants to show it to them since most have never seen one. Also have some pesos and some paper money from South Korea and Japan sent to me a long time ago by a military friend who served there. Gives them an opportunity to view other currency and for us to talk about exchange rates and other country’s money. Most think money from other countries is fake when they first see it.