perfidy

It is important to understand English, I suppose. Either that or to get thicker skin:

I had a bunch of Euros I needed to exchange, so I went to the currency exchange window at the local bank.

Just one lady in front of me . . . an Asian lady, who was trying to exchange yen for dollars, and she was a little irritated.

She kept asking the teller, 'Why it change?? Why it change?? Why it change??' Then she continued, 'Yesterday, I get two hunat dolla fo yen. Today I get ony hunat eighty dolla?? Why it change?'

The teller shrugged his shoulders and said, simply and carefully, 'Fluctuations.'

The Asian lady glares at the banker, 'Fluc you white people, too!'