Since no one is mentioning it I will. If the stock market crashes, dollars move to treasuries. If the demand for treasuries skyrocket, the interest rate on treasuries drops dramatically. There's 9.2 trillion dollars US debt in the form of low interest treasuries up for refinancing this year. Refinancing them at the current treasury rate will add a huge burden to government expenditures.
However, if you drop the nominal interest rate to say 2%, that saves about $460 billion a year in interest on the 9.2 trillion, or $3.58 trillion over the life of the treasuries.
It's just a dumb theory, but blow the stock market up, lower treasury rates, refinance, prop the market back up again.
Seem's like a buying opportunity ahead perhaps.