Conversations in the car

Since my oldest child could speak, I have been having conversations.  If you are a parent, you have had or will have these talks.  Once we got to talk about (well, mostly we listened to a monologue about) Morgen's frog dream.  Another time it had to do with why we walk on the sidewalk and not in the road.  I remember overhearing an exchange between two of my children that began with:
"You're an idiot!"
And ended with:
"Well, you're something even worse- you are an IDIOM!!"
And, while they can be frustrating, they are also really funny :).

But with my younger son now 10 years old, I thought the days of these sorts of dialogues were over.  Not so, it appears.  A few nights ago, Hyrum and I went over to the high school to pick Walker up after his performance (Pirates of Penzance- last show is Saturday!).  We had gotten back into the car, and I reminded the boys to put on their seatbelts, like I always do.  And then this happened:
Hyrum- "I'm invisible! I can't wear a seatbelt because then you would see me!"
me- (trying very hard not to giggle because he totally makes sense) "It's an invisible seatbelt.  Wear it or fly home, superman."
Hmmmm.  Apparently, invisibility is not one of Superman's powers.  But it is one of Hyrum's.  Who knew?!