It's one of my biggest pet peeves. People who pull their vehicle over on the wrong side of the road, so they can roll down the driver's window and get the mail out of the mailbox without getting out of the vehicle. It's dangerous and shows just how lazy we've become.
I see people do this on busy state highways and winding, hilly country roads. Sooner or later an accident is going to happen in my area because some body is too lazy to park their car at the end of their driveway and walk the ten feet to the mailbox.
It's bugs me just about as much as the bicyclist and pedestrians who can't figure out what side of the road the belong on.