Google 'bank run' and 'bank holiday'. People will lose faith in the safety of their money in the banks and will be looking for anywhere safe to park their money.
That would be Gold and Silver, Agricultural assets and (where not bubbled) bricks and mortar.
Do yourself another favour - go to youtube and look up 'Jim Rogers' - he's a moderate voice and a well regarded one - was part of the Quantum fund (along with Jim Soros) - the man is worth listening to.