If I wasn't working at UPS I think I would start crying and I'm serious. If I wasn't working at UPS I would be at a job that pays less, is less secure, has no retirement potential, and would not be as enjoyable.
I'm guessing many people are laughing right now about my "enjoyable" comment but I'm serious. Aside from being a pro-athlete or owning my own business, I can't think of another job I would rather perform. Perhaps a wildlife photorapher or biologist may be better?
I don't want to sit behind a desk all day. I don't want to be a mechanic and have to get under a vehicle on my back and stick my hands into an engine (I'd rather spend my hour delivering 20 house calls in a blizzard!).
The above holds true for standing on a roof, doing any heating/plumbing, or building anything with wood/cement. I'd rather be outdoors delivering parcels with no worries even if it is less money than having a trade.