I was standing in line to buy gum at the LA airport and the skinny woman in front of me raised her arms high up in the air and started applying deodorant. The bathroom was less than 10 feet away. I saw someone else flipping through magazines and absentmindedly sticking her chewed wad of gum under the shelf without even looking around to see if she was being watched. There was a family sprawled out on the bare floor, with their faces resting directly against the cold, filthy tile. And a couple making out. Her hair was long and shaggy and her head thrown back as he nibbled on her neck and shoved his hands into the stretched out back pockets of her jeans.
If I was from another planet and wanted to study humankind, I'd pick an airport.