Inside his head

Every night during dinner, my brother tells us jokes that occurred to him at school.  I swear he has a running narrative in that head of his, but that's a story for another night.  My dad bought him a watch for his birthday last week and asked him if he was enjoying wearing it.

"Yea, it was great in class today!"
"What happened?"
"Well my teachers are always running into lunch, so today when my math teacher asked, 'What's 34 divided by 2', I looked at my wrist and thought, It's 5 past 12.  Can we go now? 

At least his jokes stay inside his head.