Since I've already started talking about banks, here's something interesting: even though Hong Kong is considered part of China, it has its own currency. But here's the kicker—it's not printed by the local central bank. Instead, three commercial banks print it: HSBC, Standard Chartered Bank, and Bank of China. And each one has their own design (sometimes even multiple versions). Talk about a counterfeiter's paradise! :)

The only exception is the ten-dollar note. That one's printed by the central bank itself.