Ever Hear of Mickey Mouse Money?

That's what they used to call Japanese Government paper money in countries they invaded in WWII. I had never thought about what happens to a country's money during a war. Wikipedia has a very interesting article here on that:
http://en.wikipedia.org/wiki/Japanese_invasion_money

Check out this paper money here:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290576109173