A couple of days ago, I gave my standard diatribe about the importance of putting numbers in context, especially budget numbers, which as isolated billions or trillions are virtually meaningless to the typical reader. In some cases, the issue is not just one of being uninformative, it's also a question of actually being wrong.
In budget reporting, the most obvious case in which out of context is wrong, is when comparisons of the deficit are made through time. There have been many news reports pronouncing the Bush deficits the largest in history based on the fact that nominal deficits (which peaked at $413 billion in 2004) were larger than the size of the deficits in any prior year.