The worst case scenario is if the Dollar, Bond, and Equities start going down together as the world repudiates the US Dollar Reserve Currency and Credit Bubble.
This is not a probable scenario.
The last time it happened was in 1933 in the trough of the Great Depression.
But we may have the opportunity to see something as once-in-a-lifetime and memorable as John Law's Banque Générale and the Mississipi Bubble.
Let's hope the Federal Reserve can reach deeper in its pockets for a better class of tricks than just front running the dollar and the bonds until they fall over.
Certainly anything is possible, but it does appear as though the US Long Bond is hitting a 'high note' of improbable valuation unless the world accepts a single currency dollar regime.
"O that I could find in the desert a wayside shelter for travelers, that I might depart from my people. For they are all adulterers, an unfaithful mob of traitors. Their tongues are devious weapons, bent like drawn bows. With falsehoods rather than truth they have gained power. They commit one crime after another. They do not know me, says the Lord. I will make Jerusalem a heap of ruins, the lair of jackals. I will lay waste to Judah, a desolation where no one can live."
Jeremiah 9:2-3,11