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

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

She asked the teller, "Why it change? Yesterday, I get two hunat dolla fo yen. Today I get hunat eighty. Why it change?"

The teller shrugged his shoulders and said, "Fluctuations."