Never!
Set nonobvious answers to your security questions, then store those nonobvious answers in your high-quality, attack-resistant password manager. Either LastPass or 1Password are good choices.
The reason security questions are generally focused on things you can easily remember is that you never want to forget those answers; otherwise, you can’t prove you are who you say you are. Unfortunately, the easier they are to remember, the easier they are for an attacker to guess.
Example: The security question is, “What was your first car?”
Instead of saying it was a Chevy Nova, choose an alpha-numeric response that doesn’t fit the prompt, such as Applechicken22.