What are people thinking?

Do you ask yourself that often? "What were they thinking?"
Coming home from Christmas I was taking a shuttle home from Salt Lake City Airport. Well, we stopped at a gas station and while the driver ran inside real quick one of the other passengers got off the bus. A minute later I looked out my window and here was that passenger right outside my window leaning over the gas pump smoking his cigarette. I looked over at the guy sitting across the isle from me cause we both noticed this man at the same time - the guy across the isle jumped off the bus and told smoking man to put out his cigarette. The smoking man seemed somewhat annoyed! Hello, Highly Flammable! What the heck was he thinking? I feel like I almost got blown up that night... :)