Hell bank notes are afterlife monetary papers used in traditional Chinese ancestor veneration. Both currencies have many zero-s and both are equally useless for transaction in real world.
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* see the fine print in the center:
on or before 31st Dec 2008 ... ...
Issue date: 2nd May 2008
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(at least this does not have expiry date)
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* On February 2009, the exchange rate is 1 US dollar = 300,000,000,000,000 Zimbabwean Dollar. On April 2009, the Zimbabwean government decided to suspend the currency indefinitely.