Out of time, out of place

Conversation with Jr. while driving her back from class

Me: did you know that your cousins and uncle went to a high school football game ? Apparently it is called a .. 

Jr. : Homecoming game.. I know. Do you know why it is called a homecoming game?

Me: No. 

Jr. : (starts explaining something about games, winning, losing, parties, etc. etc.) and sees my eyes glaze over in the rear view mirror and asks "do you know what a homecoming is?"

Me : No.

Jr. : didn't you have any school rivalries when you went to school?

Me: No.

Jr. : Didn't you have homecoming games?

Me: No.

Jr. : thinks for a second and goes "okay. let's start with the basics. Did you go to high school?! "

Next time I have to start steering the conversation in a different direction.