I have to confess, this was ACTUALLY my own grandmother; We were flying as a family to Washington on United and granny wanted to purchase some duty free. Cabin crew were lovely and VERY patient when she queried the fact that the onboard prices were in US$
She then asked when the USA was going to convert to Euros as her home country (no names but it's where leprechauns come from!) had had to!!!!
I love the idea of the most powerful currency in the world being absorbed into the Eurozone
Doh!