Marbles on the Highway

At supper tonight, this is the conversation that took place:

Sadie: When I was little, my dad used to tell us to go play marbles on the highway when he was annoyed with us.

Addy: Why?

Sadie: Think about it for a minute...what would happen if you played marbles on the highway?

Addy: Um...the cars would run over the marbles and pop their tires...?

{Everyone besides Addy busts out into laughter}

Creighton (giggling): Addy!!  You would get run over!

Addy: Ooooohhhh!!!  Well she didn't say 'what would happen TO YOU if you played marbles on the highway' so I didn't know!!

What are we going to do with this girl?!