Now, back in the day, I had a rule of thumb in hand-selecting my missed opportunities. It had to be something that was (1) an opportunity and (2) missed. Ole' Karolina Backwards and Edsilia Dutch are very nice in their own ways, but they both got to the Eurovision stage so you can't really say that the representative broadcaster of their respective national countries had really missed a trick.
HRT, on the other hand, had opportunities to spare in 2000 and they missed nearly all of them. Here's just one. Free language has rarely been so.... free.