It actually went limit down on tuesday morning around 2AM. It must have been those frenchies at SG waking up and start selling again the eminis.Quote from invertedCurve:
spooz almost went limit down yesterday, (1255) No limit up
On November 7, 2007, the NYSE confirmed that the exchange has scrapped this rule as of November 2. The reason given for the rule's elimination was its ineffectiveness in curbing market volatility.
http://en.wikipedia.org/wiki/Trading_curb
But there still is limit down in Spooz futures.
http://www.allstocks.com/html/futures_limit_downs.html