Off the side of the road of I-40 as a kid...pretty much a rite of passage as an American boy. Nowadays, I find a proper location, although county routes suffice if you've gotta go.
About 15 years ago, I got a little lost by some orange groves, and pulled over onto a dirt path, walked a few feet away, and completed my transaction. Walked back to the car, and a pickup truck with two Bubbas shouted "Hey, you ain't taking any fruit, are ya!" I pointed to my puddle with both open hands, and they laughed and sped off. Never steal any citrus fruit, from what I'd heard. Otherwise, I don't know what would have happened...