Public Service Announcment, defending against identity fraud.

When your bank or credit card calls you, do not "verify your identity" with your SSN, MMN, password, etc. You do that when you call them.

An example of a smart guy doing it the right way is here.

(And this would be a good idea to call up all your banks and credit cards, and change your voice password aka "mother's maiden name", to something other than your mother's maiden name...)