And if they start putting dampers on the doors. There are two ways I can tell UPS is delivering:

* The extremely loud engine and exhaust. (They are loud and unpleasant to listen to - it ain't no Ferrari)

* The slamming of the doors open and closed.

If I hear a loud agricultural sounding engine and then a loud slamming sliding type door... I know it's UPS - 100%. I don't even need to look outside.