In Ecuador, where, in response to hyperinflation, its currency has been pegged to the U.S. dollar for the past 15 years, there is a strong demand for $2 bills to the point where black markets offer them up for sometimes two or three times their face value, according to the Billfold. There, according to the author, they are used not just as legal tender but good luck charms as well—keep them in your wallet, and you’ll have good luck. This is in marked contrast to a superstition in the U.S.  that says the bills are, in fact, bad luck (unless you tear off the corner, in which case it’s just a regular bill). Perhaps it might be good, though, to take this story with a grain of salt—we searched around to find some sort of confirmation of this superstition, and after some time was only able to find this mention in a travel book.