Earlier quoted context omitted.
Security questions should be treated as secondary password fields, since they are that. Use Diceware for a good tradeoff between entropy and memorability/pronounceability or more complex random passwords and store them in a safe place.
This works well until you get to the "Our site is so secure that we need you to answer three security questions from our canned list, and they can't all be the same string" geniuses. Such an antipattern.
Q: what was your childhood best friend's last name? A: pathway-titian-slowly-quiver-kodiak-hue
etc., even for fact-based things like "what city were you born in?" or "what street did you live on in 1995?".