Short piece by John Crudele illustrates why it is so difficult to control government spending. If you try to micromanage--don't spend money on X--the bureaucrats will tend, as here, to redefine X.
If, on the other hand, you just take a meat ax to the overall budget of an agency, the agency will respond by cutting the one or two most popular activities it undertakes, sometimes known as the "Washington Monument" strategy. (If you cut money going to the national parks, the Park Service threatens to close the Monument.)
Lesson #1: don't spend the money in the first place.
Lesson #2: if you did, you have to have a lot of guts, guile, and patience to cut.