this joke really cracked me up..

Why it's important to understand English

I had a bunch of Canadian dollars 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 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".

The Asian lady says, "Fluc you white people, too!"