Ask them to take an instant photo with nothing in it, and take a picture of it with a smartphone borrowed from the other party.
After having one of the cards with the names of cities in the world selected, when you look at the pictures you took, you can see that city in the picture that the other person has!
JPY 
Euros
British Pounds
Australia Dollars
US Dollars
Canada Dollars
Chinese Yuan
Singapore Dollar
Hong Kong Dollar
