It must be hard for former presidential couples to adjust to life after the White House. After four or more years, they probably get used to never having to take out the trash, wash dishes or change a light bulb, not to mention the other amenities afforded to arguably the most powerful people in the Western world. Perhaps that's why some have stuck around after their terms -- and lives -- ended. That's right: 1600 Pennsylvania Ave. is not only the most famous address in the United States, but also one of the most haunted.