Here's one of my favorite "developmentally inappropriate" stories.
I was driving from Illinois to Indiana with a 7 year old. You'll recognize the routine: Every five minutes she asked, "Are we almost there? When are we gonna get there?"
I explained that our trip would take about the same amount of time as the beginning of school until lunchtime. I explained we were driving from the state where she lived--Illinois--to the state right next to it. Maybe I talked about Indiana and Illinois as being two of our 50 United States. I pointed out the sign, "Welcome to Indiana."
The conversation was fraught with abstract concepts that a 7 year old doesn't yet comprehend: states, crossing from one state to another, and the United States. I knew all this after 20 years of teaching kids her age, and knew that my explanation was a stretch for a 7 year old, but I thought I did a decent job of it.
A few minutes later she called home. Her dad asked where she was, and I still laugh to remember her answer: "We're still in America, Dad, but we're on a different road!"