1. Converting wrong and getting way too much cash from an ATM
Those living in the European Union, like me, are spoiled. We use euros and we can use them in the vast majority of the EU. Traveling to France or Spain or Germany? No problem. In Hungary however, they use the Hungarian Florint (HUF). One euro is now 312 HUF. If you don’t pay close attention to currency conversion, like I did, you might end up withdrawing 10 times the amount of money you need, two days before departure. Oops. I converted the extra back to euros but lost a lot of money in the exchange process.