... when your wife has to remind you to switch the dash display back to temp gauge from MPG gauge. Every time.
... when same wife asks why you keep moving the hedgehog (stuffed animal) off the dash board. And your answer is, "so you can see the temp gauge".
... when your 6 year old daughter knows what a grill block is, and asks if she can hand me the zip ties and hold the flashlight on the next project too.
... when same daughter notices that the fast cool looking car that went by is now next to us at the red light. And you look at it as a 'teaching' moment more than a 'cool car' moment.