quote from link
Switzerland has become the world's second biggest source of carry-trade credit after Japan as hedge funds and banks borrow tens of billions to lend elsewhere, especially in Eastern Europe....In 1998, the yen strengthened from nearly yen130 to yen110 to the dollar in just two days after Russia's default on panic unwinding of carry trade bets. Such a fall today could set off mass defaults, given the much larger scale of derivative contracts.
http://www.telegraph.co.uk/money/main.jhtml?xml=/money/2006/11/30/cnswiss30.xml