What warning signs are you looking for?

[Scythe13]

Just a little curious of what people are looking for, in regard to knowing when TSHasHTF.

Things like a run on 2 banks at the same time or in the same week.
Gold or silver to break a certain point.
Bond market to reach a limit.
Debt recall by another country.
Declaration of war against...X...
City Riots
Empty Shelves in supermarkets for X number of days.
Radio broadcasts from friends.
TV announcement about WW£
The sky to go black and stay black for longer than 24 hours

Or what?

Does anyone have specific criteria that, to them, signifies that the poop has started to spray and it's time to baton down the hatches?