I’ve become significantly more diligent about saying please and thank you at home in the past couple of years.
This learning/change in behavior had one root cause – attempting to teach our kids to do the same. As kids (like most other humans) ignore what I say and watch what I do, the only way to influence their behavior was to change mine.
This is why teaching is an effective way to learn something. To earn your chops as a teacher, you have to do the work to learn it yourself.