I once ordered tires for my car to be delievered via UPS. I was waiting when the guy arrived, and went outside so he wouldn't have to carry them all in for me. So he goes into his truck and opens the back door and ~10 small packages fall out of the back. He then proceeds to wade through a knee-high sea of packages piled on the floor to retrieve my tires and throws them (per my instruction, they're just tires!) out the back door.
I'm not sure why, but I always imagined a UPS truck to be a well-organized ordeal, with packages lined on shelves in some order related to the relative delivery point along the route.
Apparently not.
every driver is different. some are more organized and professional then others. just like any profession