Existing code is a design constraint. Always code as if you were writing the final, production version. Develop standards and follow them. Someday that drooling idiot will be you. For some reason programmers document the obvious and leave the kludge unspoiled by explanation.
Simplicity is often a blessing.
On the other hand, whenever you're tempted into cleverness, imagine yourself sitting behind the keyboard staring blankly into the screen at three in the morning trying to figure out just what you meant by that. For Christ's sake, pay attention. Don't ignore it. Individual liberty and American market capitalism sweep Eastern Europe and the old Soviet Union. Mickey Mouse has invaded France.