I will never hear or see this word again without thinking of this joke.

I was at my bank today; there was a short line. front of me, an Asian lady who was
trying to exchange yen for dollars. It was obvious she was very irritated.

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

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