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A friend of mine was a radio officer in the Merchant navy, he saved embassy coupons.
One time while on a night out with friends in Brazil, he was sat at a bar counting his coupons when a lady of the night came over to him and asked what country that money comes from, it's from the bank of embassy he replied, he was counting quite a stack of vouchers valued at 10, she looked thoughtful (perhaps trying to work out the exchange rate), then said, I will be yours for the night if you pay me forty embassys.
He claims to have declined the offer, stating that their pimps protect the girls with guns over there, he didn't fancy his chances if she had discovered what they really were.