Earlier in the day I was wheeling the Sardine around town, chattering to him as we strolled along, "Now we're turning right, we're heading south. See, there are 4 cardinal directions, north, south, east, west. We live on the West Coast, Papa grew up on the East Coast," etc. etc., just rambling.
Tonight as I was seating some people the gentleman said, "Oh you and your son passed my house today. Sounded like you were teaching him physics or something. Talking about north, south." I didn't tell him it was actually geography, but hell, I've gotta watch what I say.