Comment by mprime1

And you can compose them from "pre shared" secrets.

For example, the password hint for a secret I send to my sister:

- The name of our neighbors cat

- The name of your first boyfriend who scratched dad's car

- Mom's nickname for aunt Ilda

Concatenate those three with a dot. And voila, a pretty secure password without need of a side channel.

(just made this up, I don't have a sister...)