Are you using a weak password? You know, your kids / grand kids names with a number of it? Then when you HAVE to change your password (because you won't change it if you don't have to) you just increase the number by 1?
Not such a smart idea, but you're not alone. Check out these figures:
It isn't that hard to come up with a secure password. Simply adding a CAPITAL letter (or 2), putting in a digit (or 2), or some of those hieroglyphic characters that are on your keyboard but only used to block out things (e.g. #@%&!!).
Another tip is to use a bible reference. These are pretty secure and may help guide your thinking. Psalm 25 is a pretty good password. Psalm 25:12 is even better!