Here is a pertinent website: The Truck Driver's Gear Change Hall of Shame. Even if you didn't know what I was talking about in the last post, spend a while on this site and you will understand fully.
Although, I do have some quibble with their name. It was obviously coined by someone who is unfamiliar with shifting a big rig. In fact, several people I have run into have commented on a loud noise made by a truck, saying that they were down-shifting, when in fact it was only the driver turning on his unmuffled jake brakes. I hear trucks doing this all the time on IH35 in downtown S.A. and lemme tell ya, there is simply no excuse for this in the flatlands. It's just laziness and bad driving.