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 guy
in front of me.

The guy in front of me was an Asian guy who was trying to exchange yen
for dollars and he was a little agitated.

He asked the teller, "Why it change?  Yesterday I get two hunat dolla
of Yen - today I get hunat eighty?   Why it change?"

The teller replies, "Fluctuations."

The Asian guy says, "Fluc you too"