Note to Future Self: Be Quiet.

While driving around your teenage son and a friend, don't comment out loud about the driving habits of others, specifically griping about the inability of them to properly operate a turn signal. Your fresh-out-of-Drivers-Ed son will not hesitate to point out that you haven't used your turn signal once while he's been in the car with you.

Oh. (Blink. Blink.)

At least I know he was listening in class...