For some reason I had to redirect my salary transfer to a new bank, but I kept all of my accounts at my old one too (and just to make life more complicated my old bank was bought by another one, so everything was migrated to this new, third bank). After receiving the monthly payment I wanted to transfer some amount to my other account. At this old bank I had multiple accounts for multiple currencies. Since the new bank has a different online banking system, the order of my accounts was mixed up. When I copied the account number to transfer the money, I accidentally copied the USD number, not the HUF’s one. By the time I realized my mistake the transfer was started, so the originating bank couldn’t cancel it. I called the target bank to see if they can wire the money to my HUF account by any chance. Of course they couldn’t. This little mistake made me lose around $100 on currency conversion. Just one little ID mistake. Of course I already made much more with the bank’s credit card offerings, but I was really upset with myself for this tiny little mistake. Annoying, isn’t it?