Mountain driving

For Thanksgiving this year, we went to the boondocks of Virginia. We had to drive over some small mountains, really just big hills, but for us in flat land, they seemed pretty big. As we approached them, Offspring's eyes got huge and he said 'wowwwww' ... I told him that we were going to drive over them to get to where we were going and he sat in awe for a few minutes. I could see the wheels turning, then he said in a very serious voice "Mom? Do you think we're going to need oxygen masks?"