Do I know his kid?

I teach a night class that ends at 8:50pm.  Or at least it's supposed to end at 8:50pm.  Every time I teach I end up staying at school much later for one reason or another.  One week it was because a student wanted me to teach her math in English.  Another time it was because a boy wanted to ask me about the education system in America compared to the education system in Korea.  And one time it was to eat peaches.

The teachers at school for the first three weeks were feeding me peaches on a regular basis.  A lot of peaches.  Every time I'd think that I had eaten enough and could sneak away to do work, I was called back to eat more peaches.  Don't get me wrong, they tasted delicious.  I just didn't want to eat that many peaches in one sitting.  

So one evening after night class, I came back to my office to find that the principal, vice-principal, and a billion other middle-aged male teachers were sitting around eating peaches and grapes.  I had hoped that this was some sort of male bonding thing that I could get out of so I could go home and relax but I was very wrong.  I had to sit next to the principal and eat peaches.  But to my surprise, there was a new face in the crowd.  I was told that he was the parent of a student and greeted him accordingly.  Then the vice principal, who speaks very very little English says out of nowhere, "His son has a giant head!  You know?"  

Umm, what?!  Why is this the only complete English sentence that you know?!?  I'm a little concerned about what sentences you're picking up on a regular basis.  And no, I do not know who his son is based off of the size of his head.  Lots of kids have giant heads.  It is not a distinguishing feature in high school.