I went to the bank to buy some British pounds and EU euros with my Australian dollars. As the teller handed me the requested amount of money, she said, “So are you going for work or a holiday?”

“A holiday,” I said happily.

“Lucky! How long are you gone for?”

“For three weeks.”

“Oh.” She paused for a while. “Well, I was going to say that if when you come back you have any currency left over, you can come in and sell it back to us without being charged a commission.” She eyed my wad of cash. “But you won’t have any money left over.”