Impulsive spending can be a problem all year long. But during the holiday season, it can undo family budgets and cause financial catastrophes. Although normally I am not an impulsive spender, I have to admit, I don't always know when to stop when it comes to Christmas gifts. I tend to keep buying, way past the limits I have set. This year, I have high hopes of controlling my spending and staying within the family holiday budget. (Now, if I can only get my husband to do the same, we'll be...