Id be curious to know how much physical currency has been withdrawn and if there are pressures on that. Inter-bank deposits are covered for people fleeing bad banks, but anecdotally I know a few people who are withdrawing all their hard cash. I wonder if central banks will have issues with that soon.
Why (anecdotally)? Even if the bank holding your checking/savings account fails, the US federal government insures you up to $250k. And that promise is an important one for the government to make precisely because it tips fear/security scales so that people don't do exactly what your friends are doing, which is contributing to the risk of a bank run. Do your friends actually believe the Federal Reserve itself is at risk of failure? What's the scenario they're betting against?