Thats $4 Zimbabwe Dollars there. As of today, the rate on the Reserve Bank of Zimbabwe's website listed the currency value at:
|FOREIGN CURRENCY RATES 30/01/2009|
Interbank Exchange Rate
USD$1.00 = Z$ 7,039,188,034.00!!! Holy Cow! That means the toilet paper I used last night is even worth more than these 2 sheets???