One of the typical security questions asked to verify your identity online is "What is your mother's maiden name?". Others include "your first pet's name?", "your first car?", "where were you born?" and others. If someone other than you knows these answers, they may be able to steal your identity, buy things that you'll have to pay for, or other nasty things.
If someone asked you any of these questions in an email, text or other social media, how would you answer?