Will the next government have to fight Greek flu?
It really is one of those "you-couldn't-make-it-up" moments: with just hours before the polls close in Britain's general election, US stock prices plummeted 9%.
So will the new government inherit responsibility for the second global financial crisis in less than two years?
Well that can't be ruled out.
But share prices in the US have now recovered a bit and - on most of the indices - are now down "only" 3.3% or so.
Which is a significant drop - coming as it does on a day of falling stock markets across the world - if not a catastrophic one.
So what's going on?
Well part of that 9% plunge looks like some fairly major technical hiccup, possibly a "fat finger" erroneous trade of some magnitude.
But even so, there's been a growing trend over the past few days of investors becoming much more nervous about the risk of a second global financial crisis and a return to recession.
That increasing aversion to risk has been visible in the rising price for insuring bank debt, in heightened market volatility, and in a renewed reluctance of banks to lend to each longer than overnight.
Also today we've seen strengthening gold, which is almost always correlated with investor wobbles.
As for the euro, well it remains the currency investors prefer to avoid - and after several days of relative strength, sterling fell a couple of cents against the dollar today, which is a very sharp drop.
What's behind it all?
Well it's the fear of Greek financial flu - or the anxiety that Greece will ultimately be forced to renege on its debts, that investors will then be reluctant to lend to other overstretched eurozone nations, that they too will then have to reschedule what they owe, and that this will generate tens of billions of euros of new losses for big continental banks on their holdings of eurozone bonds.
Achoooo! If eurozone economies were then to take drastic action to cut their deficits, that could lead to an economic slowdown, which could cause an escalation in losses on other bank loans, especially property loans.
For what it's worth, most investors would say the order of tumbling eurozone dominoes - or to extend the viral metaphor, the chain of contagion - runs Greece, then Portugal, then Spain, then Italy.
Were these dominoes to tumble, the world's banks would once again find themselves suffering from shortages of capital and liquidity, they'd again be constrained in their ability to lend, and we'd be back to the misery of contracting economic activity.
Now, for the avoidance of doubt, what I'm talking about is investors' fears - and it would be premature to argue that they'll become self-fulfilling.
But what is palpably clear is that €110bn bailout of Greece has been a flop, if it was supposed to persuade investors that Greece would be able to honour its obligations.
That's hardly surprising when pictures are being beamed around the world of Greek people rioting against austerity measures that - even if implemented - can't guarantee that Greece will be able to pay back all it owes.
And many will be deeply concerned that instead of listening to what markets are saying, the German chancellor Angela Merkel today said investors were simply wrong - and that she and her fellow European government heads were determined to win in what she sees as a battle with markets.
As for the UK, well it's vulnerable because of its combination of an enormous and overstretched banking sector and its record-busting public sector deficit.
That was the unsurprising message of a report today by Moodys, the credit rating agency - which incrementally added to the gloom.
Which means that the next chancellor of the exchequer will be walking a tightrope.
Should the chancellor reduce the public sector deficit too fast, well that would tip the economy back into recession - thus generating new losses for the banks and limiting their ability to provide the finance required for any exit from recession.
But reducing the deficit too slowly would unsettle investors, who might stop providing cheap loans to the public sector, thereby also increasing funding costs for the banks and - again - weakening them.
You can see why the Governor of the Bank of England said - allegedly - that the winner in this general election may soon regret its victory.