Edit: Looking at my list, I should have listed one for every alphabet Letter, instead of going chronologically.
[0]http://www.overstock.com/Books-Movies-Music-Games/The-Mis-Be...
Financial losses and windfalls / catastrophes happen far more frequently than you'd expect.
Also, my list is subject to dnautic's memory bias. Those are the names that I remember. There are certainly more. There is no currency in the history of the world that has lasted forever.
The cruzeiro was replaced by the "cruzeiro real" literally "real cruzeiro", as a hack to recover from poor fiscal policy resulting in hyperinflation. The cruzeiro real was then replaced by the 'real'.
Imagine things getting so bad that the government decides to rebrand its old currency as 'fake'.