I heard this one many years ago
During WW2 an American Air Force unit was based in the English countryside. The Air Force personnel used to use the local pub
One day an experienced Air Force man was with a new arrival. As they came to the pub one says
'These English yokels are so dumb. Wait till you see this'
They approached two locals who were having a drink at a table
The Airman put down a nickel and a dime and said
'Tell me which you think is worth more'
One local looked at the two coins, scratched his head, then said 'Arr, now Oi thinks the bigger shinier coin be worth more'
The Airmen laughed at this and walked on into the pub leaving the nickel and dime on the table
The second local says to the first 'ere Henry, you know rightly that the dime is worth twice the nickel'
'Aye, I do that, but if I said so they'd stop playing this game' then he showed his friend a bucket under table 'so far I've made $30 this month playing this game with the US airmen'