Why I should never point out things while I'm driving

Me: "Whoa, that was a big box in the road!"
E: "A rock?"
R: "Where's a rock? I didn't see a rock!"
Me: "No, a box. We already passed it."
E: "Where the box?"
R: "What kind of box?"
Me: "A big box. It's behind us now."
E: "I WANNA SEE THE BOX!!"
R: "Did you hit it? Was anything in it?"
Me: "I didn't hit it. It was empty. It's behind us. I should never have mentioned it."
E: "I WANNA SEE THE BOX!!"
R: "Ella, we passed it!"
E: "NOOOOOO!"
R: "YES!"
E: "NO!"
R: "YES!"

Me, vainly: "Look, an airplane!"