This got me thinking... what if it's already being done right now in countries experiencing a currency collapse? Reminds me of this great scene in the movie Sneakers:

Cosmo: Posit: people think a bank might be financially shaky.
Bishop: Consequence: people start to withdraw their money.
Cosmo: Result: pretty soon it is financially shaky.
Bishop: Conclusion: you can make banks fail.
Cosmo: Bzzt. I've already done that. Maybe you've heard about a few? Think bigger.
Bishop: Stock market?
Cosmo: Yes.
Bishop: Currency market?
Cosmo: Yes.
Bishop: Commodities market?
Cosmo: Yes.
Bishop: Small countries?
Cosmo: With luck, I might even be able to crash the whole damned system. Destroy all records of ownership. Think of it, Marty. No more rich people, no more poor people, everybody's the same, isn't that what we said we always wanted?
Bishop: Cos, you haven't gone crazy on me, have you?
Cosmo: Who else is going to change the world, Marty? Greenpeace?