"Jingle mail is the package containing the keys to your house that you send back to the bank when the interest rate on your adjustable-rate or IO/neg-am mortgage resets, or the property tax bill gets reassessed at double what it was two years ago, or you find out that heating and AC and repairs cost a ton of freaking money, or you lose your job because of the recession that’s coming with the housing crash, and you can’t make the payments any more."