My buddy exploited this during the "breaking down the door" Chinese wedding tradition. We (the groom's party) showed up at the bride's apartment, and the matron of honor (bride's sister) opened the door and demanded a bribe to be let in. The groom knew the bride's sister was often non-specific, so he got a bunch of Vietnamese currency (dong) from a local bank, and used that to pay the demanded bribe when the currency wasn't specified. As tradition, we were then subjected to mild hazing by the bridal party until they were satisfied the groom was worthy of the bride.

The exploit relied partially on the negotiations being conducted in Cantonese, so the matron of honor asked for "500 lumps [of money]", with most/all currency using "lump" as the measure word. The same thing could have been done in English, had he figured out which of the world's various currencies called "dollar" had the lowest exchange rate vs. the USD. The exploit was helped by the fact that Cantonese treats currencies more uniformly than English, so it's syntactically easier to substitute a different currency.

(My friend just went to a local bank and asked which currency they had on hand that had the lowest exchange rate vs. the USD. It happened to be VND.)