There are a number of events which possibly lead to a chaos phase-shift into a full global crash. I think this would be one of them:
(guardian.co.uk, 8/24/12): Angela Merkel rejects Greek pleas for extra two years to repay loans -
http://www.guardian.co.uk/business/2012/aug/24/angela-merkel-rejects-greek-pleas-loan-extension