[Rain Man]

When I was a kid, we would occasionally go places in our pickup and I'd ride in the back. I was under ten years old and I would stand and 'surf' in the bed sometimes. No one ever thought twice about it. We never climbed on the roof or the hood, of course, but we were still one mild wreck or swerve from getting thrown.

For that matter, my dad used to take me on his bread delivery route, and those trucks had no passenger seat. I was five or six years old, and I'd ride on the engine compartment while both doors were open. In retrospect, my dad could at least have closed the doors.