If you've ever been to Rome, then you've probably been to the Trevi Fountain. It is, arguably, the most famous fountain in the world. And if you've ever been to the Trevi Fountain, then you've probably thrown change into it, over your left shoulder, and hoped for good things. Lots of people do this. I did it when I was there in 2007 as a grad student. And in 2016, the fountain collected nearly US$1.5 million in change, all of which was (and still is) donated to a Catholic charity. But I can't help but wonder if this number is declining at all. I mean, I couldn't tell you the last time I handled physical money, especially coins. Though maybe this is such an entrenched tradition that people seek out change for this very purpose. The desire to want to believe things that aren't true can be a strong one.