Currency exchange joke for kids

A Japanese guy is at Los Angeles International Airport, waiting for his flight back home to Japan.

While he's waiting, he goes to the currency exchange counter to change his remaining dollars. He counts his money at the counter. "Wait a minute," he says to the clerk, "When I came here I got more dollars for my yen. What's going on here?"

"Fluctuations." says the clerk. The Japanese man stiffens. "Well! Fluck you Americans, too!"