Ask HN: How would a stock-market crash affect the bitcoin exchange rate?

In the 2008 crash, the S&P 500 dropped >50% of its value over roughly a year[1]. If that were to happen again today, how would the price of bitcoin in USD be affected?

[1] http://www.google.com/finance?chdnp=1&chdd=1&chds=1&chdv=1&chvs=maximized&chdeh=0&chfdeh=0&chdet=1384894800000&chddm=983756&chls=IntervalBasedLine&q=INDEXSP:.INX&ntsp=0&ei=45mLUtD2MeSpsge-0gE