What's up?, Whatsapp fell.
What is down?, "Whatsapp", I did not ask what's up, I asked what is down, "I replied Whatsapp is down", the heck they sound alike!.
This situation got me thinking about this:
What if the global banking networks went down and no one could transfer or withdraw cash for hours, days or weeks? And how possible is that to happen? Can all cash disappear to depend 100% on the availability of the Internet and electricity?