So this japanese guy is living in new york. He goes to the bank and hands the teller 1 yen. The teller hands him back $1 and thanks him. The japanese man says "yesterday i came in and gave you 1 yen and i got $1.80 back, how come today i come in and you give me $1". The teller just looks at him, smiles, and says "Fluctuation". The japanese guy gets an angry look on his face and looks at the teller and says "no, f@#$ you white man"
if you didn't get it, fluctuation sounds like "f$#@ you Asian"